From af2f2b21443073a112aedb5da5d3221efe6aee64 Mon Sep 17 00:00:00 2001
From: jleo3 <joseph.leo3@gmail.com>
Date: Tue, 18 Aug 2026 12:01:34 -0400
Subject: [PATCH] Expand conformance suite to per-rule fixture coverage, gated
 (herb-embedded-ag7)

Adds one hand-written .html.erb fixture per rule the vendored bundle
registers (100 rules, verified as the true complete count against
node_modules/@herb-tools/linter's src/rules/), under
spec/conformance/fixtures/rules/. Each fixture is authored by reading the
rule's TypeScript source and validated to trigger the rule via the real
reference linter CLI.

conformance_spec.rb's existing reference_offenses/bridge_offenses helpers
gain optional only:/rules: args (not duplicated) so a per-rule fixture can
run --only <rule> / rules: [rule] the same way gu7/ada's Bridge#lint specs
already do - this also lets not-enabled-by-default rules get exercised
directly. A new test enumerates bridge.rule_names and asserts every one has
a fixture, so a newly-added upstream rule with no fixture fails the build
instead of going untested silently. Three rules that only enable themselves
for partial files (basename starting with _) get underscore-prefixed
fixture filenames to trigger correctly.

Running the full suite surfaced a real, previously-undetected bridge bug:
__herbLint/__herbAutofix construct the vendored Linter without its 4th
constructor arg (allAvailableRules), which defaults to just the
currently-selected rule subset when omitted. herb-disable-comment-unnecessary
reads context.validRuleNames (derived from that arg) to recognize other
rules referenced in a herb:disable comment, so under our one-rule-at-a-time
execution model it could never recognize any rule but itself. Fixed by
passing HerbLinter.rules (the full registry) explicitly at both call sites.

CHARTER.md's "conformance punch list isn't closed" open question is updated
to reflect that the fixture-coverage dimension is now closed, without
overclaiming the separate .herb.yml config-application item it also named.
---
 CHARTER.md                                    | 17 +++--
 js/ruby_backend.js                            | 13 +++-
 spec/conformance/conformance_spec.rb          | 64 +++++++++++++++++--
 ...tionview-strict-locals-first-line.html.erb |  2 +
 ...no-instance-variables-in-partials.html.erb |  1 +
 .../_erb-strict-locals-required.html.erb      |  1 +
 .../a11y-avoid-generic-link-text.html.erb     |  1 +
 .../rules/a11y-disabled-attribute.html.erb    |  1 +
 .../a11y-nested-interactive-elements.html.erb |  1 +
 .../a11y-no-accesskey-attribute.html.erb      |  1 +
 .../rules/a11y-no-aria-label-misuse.html.erb  |  1 +
 ...a11y-no-aria-unsupported-elements.html.erb |  1 +
 .../a11y-no-autofocus-attribute.html.erb      |  1 +
 .../a11y-no-redundant-image-alt.html.erb      |  1 +
 .../a11y-svg-has-accessible-text.html.erb     |  1 +
 .../actionview-no-silent-helper.html.erb      |  1 +
 .../actionview-no-silent-render.html.erb      |  1 +
 ...iew-no-unnecessary-tag-attributes.html.erb |  1 +
 ...ctionview-no-void-element-content.html.erb |  1 +
 ...onview-strict-locals-partial-only.html.erb |  3 +
 .../rules/erb-comment-syntax.html.erb         |  1 +
 .../rules/erb-no-case-node-children.html.erb  |  5 ++
 .../erb-no-commented-out-output-tags.html.erb |  1 +
 .../erb-no-conditional-html-element.html.erb  |  7 ++
 .../erb-no-conditional-open-tag.html.erb      |  7 ++
 .../rules/erb-no-debug-output.html.erb        |  1 +
 .../erb-no-duplicate-branch-elements.html.erb |  5 ++
 .../rules/erb-no-empty-control-flow.html.erb  |  2 +
 .../fixtures/rules/erb-no-empty-tags.html.erb |  1 +
 .../rules/erb-no-extra-newline.html.erb       |  5 ++
 ...b-no-extra-whitespace-inside-tags.html.erb |  1 +
 .../erb-no-inline-case-conditions.html.erb    |  3 +
 .../erb-no-interpolated-class-names.html.erb  |  1 +
 .../erb-no-javascript-tag-helper.html.erb     |  3 +
 .../rules/erb-no-output-control-flow.html.erb |  3 +
 .../erb-no-output-in-attribute-name.html.erb  |  1 +
 ...b-no-output-in-attribute-position.html.erb |  1 +
 ...-no-raw-output-in-attribute-value.html.erb |  1 +
 .../rules/erb-no-silent-statement.html.erb    |  1 +
 ...b-no-silent-tag-in-attribute-name.html.erb |  1 +
 .../rules/erb-no-statement-in-script.html.erb |  3 +
 .../erb-no-then-in-control-flow.html.erb      |  3 +
 .../rules/erb-no-trailing-whitespace.html.erb |  2 +
 .../rules/erb-no-unsafe-js-attribute.html.erb |  1 +
 .../fixtures/rules/erb-no-unsafe-raw.html.erb |  1 +
 ...rb-no-unsafe-script-interpolation.html.erb |  3 +
 .../rules/erb-no-unused-expressions.html.erb  |  1 +
 .../rules/erb-no-unused-literals.html.erb     |  1 +
 .../rules/erb-prefer-direct-output.html.erb   |  1 +
 .../erb-prefer-image-tag-helper.html.erb      |  1 +
 .../erb-require-trailing-newline.html.erb     |  2 +
 ...rb-require-whitespace-inside-tags.html.erb |  1 +
 .../fixtures/rules/erb-right-trim.html.erb    |  1 +
 .../erb-strict-locals-comment-syntax.html.erb |  1 +
 .../herb-disable-comment-malformed.html.erb   |  1 +
 ...erb-disable-comment-missing-rules.html.erb |  1 +
 ...isable-comment-no-duplicate-rules.html.erb |  1 +
 ...-disable-comment-no-redundant-all.html.erb |  1 +
 .../herb-disable-comment-unnecessary.html.erb |  1 +
 ...b-disable-comment-valid-rule-name.html.erb |  1 +
 .../rules/html-allowed-script-type.html.erb   |  1 +
 .../rules/html-anchor-require-href.html.erb   |  1 +
 ...html-aria-attribute-must-be-valid.html.erb |  1 +
 ...html-aria-label-is-well-formatted.html.erb |  1 +
 .../html-aria-level-must-be-valid.html.erb    |  1 +
 ...-aria-role-heading-requires-level.html.erb |  1 +
 .../html-aria-role-must-be-valid.html.erb     |  1 +
 .../html-attribute-double-quotes.html.erb     |  1 +
 .../html-attribute-equals-spacing.html.erb    |  1 +
 ...l-attribute-values-require-quotes.html.erb |  1 +
 ...d-both-disabled-and-aria-disabled.html.erb |  1 +
 .../rules/html-body-only-elements.html.erb    |  6 ++
 .../html-boolean-attributes-no-value.html.erb |  1 +
 .../rules/html-details-has-summary.html.erb   |  3 +
 .../rules/html-head-only-elements.html.erb    |  6 ++
 .../rules/html-iframe-has-title.html.erb      |  1 +
 .../rules/html-img-require-alt.html.erb       |  1 +
 .../html-input-require-autocomplete.html.erb  |  1 +
 .../rules/html-navigation-has-label.html.erb  |  1 +
 .../rules/html-no-abstract-roles.html.erb     |  1 +
 .../html-no-aria-hidden-on-body.html.erb      |  3 +
 .../html-no-aria-hidden-on-focusable.html.erb |  1 +
 .../html-no-block-inside-inline.html.erb      |  1 +
 .../html-no-duplicate-attributes.html.erb     |  1 +
 .../rules/html-no-duplicate-ids.html.erb      |  2 +
 .../html-no-duplicate-meta-names.html.erb     |  4 ++
 .../rules/html-no-empty-attributes.html.erb   |  1 +
 .../rules/html-no-empty-headings.html.erb     |  1 +
 .../rules/html-no-nested-links.html.erb       |  1 +
 .../rules/html-no-positive-tab-index.html.erb |  1 +
 .../rules/html-no-self-closing.html.erb       |  1 +
 .../rules/html-no-space-in-tag.html.erb       |  1 +
 .../rules/html-no-title-attribute.html.erb    |  1 +
 ...no-underscores-in-attribute-names.html.erb |  1 +
 .../rules/html-no-unescaped-entities.html.erb |  1 +
 .../rules/html-no-unknown-tag.html.erb        |  1 +
 .../rules/html-require-closing-tags.html.erb  |  4 ++
 .../rules/html-require-script-nonce.html.erb  |  3 +
 .../rules/html-tag-name-lowercase.html.erb    |  1 +
 .../fixtures/rules/parser-no-errors.html.erb  |  1 +
 .../rules/source-indentation.html.erb         |  3 +
 .../svg-tag-name-capitalization.html.erb      |  1 +
 .../rules/turbo-permanent-require-id.html.erb |  1 +
 103 files changed, 248 insertions(+), 13 deletions(-)
 create mode 100644 spec/conformance/fixtures/rules/_actionview-strict-locals-first-line.html.erb
 create mode 100644 spec/conformance/fixtures/rules/_erb-no-instance-variables-in-partials.html.erb
 create mode 100644 spec/conformance/fixtures/rules/_erb-strict-locals-required.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-avoid-generic-link-text.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-disabled-attribute.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-nested-interactive-elements.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-no-accesskey-attribute.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-no-aria-label-misuse.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-no-aria-unsupported-elements.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-no-autofocus-attribute.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-no-redundant-image-alt.html.erb
 create mode 100644 spec/conformance/fixtures/rules/a11y-svg-has-accessible-text.html.erb
 create mode 100644 spec/conformance/fixtures/rules/actionview-no-silent-helper.html.erb
 create mode 100644 spec/conformance/fixtures/rules/actionview-no-silent-render.html.erb
 create mode 100644 spec/conformance/fixtures/rules/actionview-no-unnecessary-tag-attributes.html.erb
 create mode 100644 spec/conformance/fixtures/rules/actionview-no-void-element-content.html.erb
 create mode 100644 spec/conformance/fixtures/rules/actionview-strict-locals-partial-only.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-comment-syntax.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-case-node-children.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-commented-out-output-tags.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-conditional-html-element.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-conditional-open-tag.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-debug-output.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-duplicate-branch-elements.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-empty-control-flow.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-empty-tags.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-extra-newline.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-extra-whitespace-inside-tags.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-inline-case-conditions.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-interpolated-class-names.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-javascript-tag-helper.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-output-control-flow.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-output-in-attribute-name.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-output-in-attribute-position.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-raw-output-in-attribute-value.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-silent-statement.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-silent-tag-in-attribute-name.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-statement-in-script.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-then-in-control-flow.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-trailing-whitespace.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-unsafe-js-attribute.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-unsafe-raw.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-unsafe-script-interpolation.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-unused-expressions.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-no-unused-literals.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-prefer-direct-output.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-prefer-image-tag-helper.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-require-trailing-newline.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-require-whitespace-inside-tags.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-right-trim.html.erb
 create mode 100644 spec/conformance/fixtures/rules/erb-strict-locals-comment-syntax.html.erb
 create mode 100644 spec/conformance/fixtures/rules/herb-disable-comment-malformed.html.erb
 create mode 100644 spec/conformance/fixtures/rules/herb-disable-comment-missing-rules.html.erb
 create mode 100644 spec/conformance/fixtures/rules/herb-disable-comment-no-duplicate-rules.html.erb
 create mode 100644 spec/conformance/fixtures/rules/herb-disable-comment-no-redundant-all.html.erb
 create mode 100644 spec/conformance/fixtures/rules/herb-disable-comment-unnecessary.html.erb
 create mode 100644 spec/conformance/fixtures/rules/herb-disable-comment-valid-rule-name.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-allowed-script-type.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-anchor-require-href.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-aria-attribute-must-be-valid.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-aria-label-is-well-formatted.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-aria-level-must-be-valid.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-aria-role-heading-requires-level.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-aria-role-must-be-valid.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-attribute-double-quotes.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-attribute-equals-spacing.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-attribute-values-require-quotes.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-avoid-both-disabled-and-aria-disabled.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-body-only-elements.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-boolean-attributes-no-value.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-details-has-summary.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-head-only-elements.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-iframe-has-title.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-img-require-alt.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-input-require-autocomplete.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-navigation-has-label.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-abstract-roles.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-aria-hidden-on-body.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-aria-hidden-on-focusable.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-block-inside-inline.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-duplicate-attributes.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-duplicate-ids.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-duplicate-meta-names.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-empty-attributes.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-empty-headings.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-nested-links.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-positive-tab-index.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-self-closing.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-space-in-tag.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-title-attribute.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-underscores-in-attribute-names.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-unescaped-entities.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-no-unknown-tag.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-require-closing-tags.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-require-script-nonce.html.erb
 create mode 100644 spec/conformance/fixtures/rules/html-tag-name-lowercase.html.erb
 create mode 100644 spec/conformance/fixtures/rules/parser-no-errors.html.erb
 create mode 100644 spec/conformance/fixtures/rules/source-indentation.html.erb
 create mode 100644 spec/conformance/fixtures/rules/svg-tag-name-capitalization.html.erb
 create mode 100644 spec/conformance/fixtures/rules/turbo-permanent-require-id.html.erb

diff --git a/CHARTER.md b/CHARTER.md
index 52b3a11..e83a7fd 100644
--- a/CHARTER.md
+++ b/CHARTER.md
@@ -157,11 +157,18 @@ already sitting in the `herb` gem's native C extension the whole time.
    `herb-lint-rb` are the current names. If Marco's gem claims `Herb::Linter` or a
    conflicting convention before herb-embedded sunsets, a rename may be needed in the
    meantime — low stakes given the planned sunset, but worth a glance when his gem surfaces.
-3. **Conformance punch list isn't closed.** The design spec's differential run against
-   `npx @herb-tools/linter` wasn't yet clean end-to-end — missing `LintContext` (filename),
-   missing `.herb.yml` config application, and per-rule `parserOptions` forwarding. Each has
-   a named cause and is tracked as implementation work in `bd` (see `herb-embedded-6dp` and
-   related beads), not a design gap.
+3. **Conformance punch list, fixture-coverage dimension: closed.** The design spec's
+   differential run against `npx @herb-tools/linter` originally wasn't clean end-to-end —
+   missing `LintContext` (filename), missing `.herb.yml` config application, and per-rule
+   `parserOptions` forwarding. `LintContext` and `parserOptions` forwarding (including
+   `prism_program`/`prism_nodes`, see the Shape decisions entry above) are resolved; each had
+   a named cause tracked as implementation work in `bd` (`herb-embedded-6dp` and related
+   beads), not a design gap. `spec/conformance/conformance_spec.rb` now runs the differential
+   offense-for-offense diff against a hand-written fixture for every one of the 100 rules the
+   vendored bundle registers (`herb-embedded-ag7`), gated so an upstream rule with no fixture
+   fails the build — not just the 5 general-purpose fixtures from before. `.herb.yml` config
+   application is unaffected by that work and still worth a look if it's ever suspected of
+   drifting from upstream.
 4. **Config schema stability.** `.herb.yml` config currently passes through to the engine
    whole. Per-rule options can change across Herb releases, so Ruby may eventually need
    version-aware translation instead of passthrough. Unresolved until it's actually observed
diff --git a/js/ruby_backend.js b/js/ruby_backend.js
index 722a630..fa4a4dc 100644
--- a/js/ruby_backend.js
+++ b/js/ruby_backend.js
@@ -161,7 +161,7 @@ function __herbRegisterCustomRule(rewrittenSource, path) {
 function __herbAutofix(source, file, ruleNames, includeUnsafe) {
   var ruleClasses = __herbSelectRules(ruleNames);
   var context = { fileName: file, filename: file };
-  var linter = new HerbLinter.Linter(__herbEmbeddedBridge.instance, ruleClasses);
+  var linter = new HerbLinter.Linter(__herbEmbeddedBridge.instance, ruleClasses, undefined, HerbLinter.rules);
   var result = linter.autofix(source, context, undefined, { includeUnsafe: !!includeUnsafe });
 
   return JSON.stringify({ source: result.source, fixed: result.fixed });
@@ -171,6 +171,15 @@ function __herbAutofix(source, file, ruleNames, includeUnsafe) {
 // throws must not abort the run (spike 2 finding) — the real Linter#lint
 // has no such isolation internally, since it runs every selected rule's
 // check() in one uncaught loop.
+//
+// The 4th constructor arg (allAvailableRules) must be the full registry,
+// not just the one rule being run: herb-disable-comment-unnecessary reads
+// context.validRuleNames (built from Linter#getAvailableRules, which
+// falls back to allAvailableRules) to decide whether a `herb:disable
+// some-other-rule` comment references a real rule — omitting this arg
+// left validRuleNames scoped to whatever single rule __herbLint happened
+// to be running, so the rule silently never matched anything outside
+// itself. Caught by conformance fixture coverage (herb-embedded-ag7).
 function __herbLint(source, file, ruleNames) {
   var ruleClasses = __herbSelectRules(ruleNames);
   var context = { fileName: file, filename: file };
@@ -178,7 +187,7 @@ function __herbLint(source, file, ruleNames) {
 
   ruleClasses.forEach(function (ruleClass) {
     try {
-      var linter = new HerbLinter.Linter(__herbEmbeddedBridge.instance, [ruleClass]);
+      var linter = new HerbLinter.Linter(__herbEmbeddedBridge.instance, [ruleClass], undefined, HerbLinter.rules);
       var result = linter.lint(source, context);
       offenses = offenses.concat(result.offenses);
     } catch (e) {
diff --git a/spec/conformance/conformance_spec.rb b/spec/conformance/conformance_spec.rb
index 3d419af..fcff14f 100644
--- a/spec/conformance/conformance_spec.rb
+++ b/spec/conformance/conformance_spec.rb
@@ -10,6 +10,18 @@
 CONFORMANCE_ROOT = File.expand_path("../..", __dir__)
 CONFORMANCE_REFERENCE_LINTER = File.join(CONFORMANCE_ROOT, "node_modules", ".bin", "herb-lint")
 CONFORMANCE_FIXTURES = Dir.glob(File.join(__dir__, "fixtures", "*.html.erb"))
+CONFORMANCE_RULE_FIXTURES = Dir.glob(File.join(__dir__, "fixtures", "rules", "*.html.erb"))
+
+# A handful of rules (erb-no-instance-variables-in-partials and friends)
+# only enable themselves for partial files (basename starting with `_`),
+# so their fixture is named with that leading underscore to trigger
+# correctly — this strips it back off to recover the rule code the
+# coverage-gate test and --only/rules: need. Top-level (not an instance
+# method) since it's needed both at spec-definition time, to build each
+# `it` description, and at example-run time.
+def conformance_rule_name_for(fixture_path)
+  File.basename(fixture_path, ".html.erb").sub(/\A_/, "")
+end
 
 # Node at test time is acceptable — the guarantee this repo makes is
 # about *user* time (see spec/no_node_spec.rb). This is the differential
@@ -23,16 +35,24 @@
 
   after { adapter.dispose }
 
-  def reference_offenses(fixture_path)
+  def reference_offenses(fixture_path, only: nil)
     # --no-github: herb-lint auto-enables GitHub Actions annotations whenever
     # GITHUB_ACTIONS=true is set (i.e. inside our own CI job), which then
     # conflicts fatally with --json ("--github cannot be used with --json
     # format"). Explicitly disabling it makes --json behavior independent of
     # the invoking environment.
-    stdout, stderr, status = Open3.capture3(
+    #
+    # --only ignores .herb.yml config entirely (including a rule's own
+    # defaultConfig.enabled), matching rules: [...] on the bridge side —
+    # both let a per-rule fixture exercise a not-enabled-by-default rule
+    # directly, the same way gu7/ada's Bridge#lint specs already do.
+    args = [
       CONFORMANCE_REFERENCE_LINTER, fixture_path, "--json", "--no-custom-rules", "--no-color", "--no-github",
-      "--jobs", "1", chdir: CONFORMANCE_ROOT
-    )
+      "--jobs", "1"
+    ]
+    args += ["--only", only] if only
+
+    stdout, stderr, status = Open3.capture3(*args, chdir: CONFORMANCE_ROOT)
     unless status.exitstatus.zero? || status.exitstatus == 1
       raise "reference herb-lint failed (exit #{status.exitstatus}): #{stderr}"
     end
@@ -44,9 +64,9 @@ def reference_offenses(fixture_path)
     JSON.parse(stdout)["offenses"].map { |o| [o["code"], o["location"]["start"]["line"], o["location"]["start"]["column"]] }
   end
 
-  def bridge_offenses(fixture_path)
+  def bridge_offenses(fixture_path, rules: nil)
     source = File.read(fixture_path)
-    bridge.lint(source, file: File.basename(fixture_path)).map { |d| [d.rule, d.line, d.column] }
+    bridge.lint(source, file: File.basename(fixture_path), rules: rules).map { |d| [d.rule, d.line, d.column] }
   end
 
   CONFORMANCE_FIXTURES.each do |fixture_path|
@@ -71,4 +91,36 @@ def bridge_offenses(fixture_path)
 
     expect(present).to include(*required)
   end
+
+  CONFORMANCE_RULE_FIXTURES.each do |fixture_path|
+    rule = conformance_rule_name_for(fixture_path)
+
+    it "matches npx @herb-tools/linter offense-for-offense on the #{rule} fixture, exercising the rule" do
+      reference = reference_offenses(fixture_path, only: rule).sort
+      actual = bridge_offenses(fixture_path, rules: [rule]).sort
+
+      expect(reference).not_to be_empty,
+                               "Fixture #{File.basename(fixture_path)} produced no reference offenses for " \
+                               "#{rule} — it doesn't actually trigger the rule"
+
+      missing = reference - actual
+      extra = actual - reference
+
+      expect([missing, extra]).to eq([[], []]), <<~MSG
+        Conformance mismatch for #{rule} (#{File.basename(fixture_path)}) — [rule, line, column] tuples:
+          Missing (npx found it, bridge did not): #{missing.inspect}
+          Extra   (bridge found it, npx did not): #{extra.inspect}
+      MSG
+    end
+  end
+
+  it "has a conformance fixture for every rule the vendored bundle registers" do
+    registered = bridge.rule_names
+    covered = CONFORMANCE_RULE_FIXTURES.map { |f| conformance_rule_name_for(f) }
+
+    missing = registered - covered
+    expect(missing).to be_empty,
+                       "Rules registered by the vendored bundle with no conformance fixture under " \
+                       "spec/conformance/fixtures/rules/: #{missing.sort.inspect}"
+  end
 end
diff --git a/spec/conformance/fixtures/rules/_actionview-strict-locals-first-line.html.erb b/spec/conformance/fixtures/rules/_actionview-strict-locals-first-line.html.erb
new file mode 100644
index 0000000..3653be2
--- /dev/null
+++ b/spec/conformance/fixtures/rules/_actionview-strict-locals-first-line.html.erb
@@ -0,0 +1,2 @@
+<p>Header</p>
+<%# locals: (title:) %>
diff --git a/spec/conformance/fixtures/rules/_erb-no-instance-variables-in-partials.html.erb b/spec/conformance/fixtures/rules/_erb-no-instance-variables-in-partials.html.erb
new file mode 100644
index 0000000..02613be
--- /dev/null
+++ b/spec/conformance/fixtures/rules/_erb-no-instance-variables-in-partials.html.erb
@@ -0,0 +1 @@
+<%= @widget_name %>
diff --git a/spec/conformance/fixtures/rules/_erb-strict-locals-required.html.erb b/spec/conformance/fixtures/rules/_erb-strict-locals-required.html.erb
new file mode 100644
index 0000000..98d12dd
--- /dev/null
+++ b/spec/conformance/fixtures/rules/_erb-strict-locals-required.html.erb
@@ -0,0 +1 @@
+<p>Hi</p>
diff --git a/spec/conformance/fixtures/rules/a11y-avoid-generic-link-text.html.erb b/spec/conformance/fixtures/rules/a11y-avoid-generic-link-text.html.erb
new file mode 100644
index 0000000..aa414e6
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-avoid-generic-link-text.html.erb
@@ -0,0 +1 @@
+<a href="/details">Click here</a>
diff --git a/spec/conformance/fixtures/rules/a11y-disabled-attribute.html.erb b/spec/conformance/fixtures/rules/a11y-disabled-attribute.html.erb
new file mode 100644
index 0000000..2aa0e78
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-disabled-attribute.html.erb
@@ -0,0 +1 @@
+<div disabled>Unavailable</div>
diff --git a/spec/conformance/fixtures/rules/a11y-nested-interactive-elements.html.erb b/spec/conformance/fixtures/rules/a11y-nested-interactive-elements.html.erb
new file mode 100644
index 0000000..2545218
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-nested-interactive-elements.html.erb
@@ -0,0 +1 @@
+<a href="/go"><button type="button">Go</button></a>
diff --git a/spec/conformance/fixtures/rules/a11y-no-accesskey-attribute.html.erb b/spec/conformance/fixtures/rules/a11y-no-accesskey-attribute.html.erb
new file mode 100644
index 0000000..0722fff
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-no-accesskey-attribute.html.erb
@@ -0,0 +1 @@
+<div accesskey="s">Save</div>
diff --git a/spec/conformance/fixtures/rules/a11y-no-aria-label-misuse.html.erb b/spec/conformance/fixtures/rules/a11y-no-aria-label-misuse.html.erb
new file mode 100644
index 0000000..c90b8f7
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-no-aria-label-misuse.html.erb
@@ -0,0 +1 @@
+<h1 aria-label="Page Title">Welcome</h1>
diff --git a/spec/conformance/fixtures/rules/a11y-no-aria-unsupported-elements.html.erb b/spec/conformance/fixtures/rules/a11y-no-aria-unsupported-elements.html.erb
new file mode 100644
index 0000000..d3a2e67
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-no-aria-unsupported-elements.html.erb
@@ -0,0 +1 @@
+<meta aria-hidden="true">
diff --git a/spec/conformance/fixtures/rules/a11y-no-autofocus-attribute.html.erb b/spec/conformance/fixtures/rules/a11y-no-autofocus-attribute.html.erb
new file mode 100644
index 0000000..5c41ee7
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-no-autofocus-attribute.html.erb
@@ -0,0 +1 @@
+<input type="text" autofocus>
diff --git a/spec/conformance/fixtures/rules/a11y-no-redundant-image-alt.html.erb b/spec/conformance/fixtures/rules/a11y-no-redundant-image-alt.html.erb
new file mode 100644
index 0000000..2d5fab2
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-no-redundant-image-alt.html.erb
@@ -0,0 +1 @@
+<img src="cat.png" alt="a cat image">
diff --git a/spec/conformance/fixtures/rules/a11y-svg-has-accessible-text.html.erb b/spec/conformance/fixtures/rules/a11y-svg-has-accessible-text.html.erb
new file mode 100644
index 0000000..4a65311
--- /dev/null
+++ b/spec/conformance/fixtures/rules/a11y-svg-has-accessible-text.html.erb
@@ -0,0 +1 @@
+<svg><rect width="10" height="10"></rect></svg>
diff --git a/spec/conformance/fixtures/rules/actionview-no-silent-helper.html.erb b/spec/conformance/fixtures/rules/actionview-no-silent-helper.html.erb
new file mode 100644
index 0000000..af2de83
--- /dev/null
+++ b/spec/conformance/fixtures/rules/actionview-no-silent-helper.html.erb
@@ -0,0 +1 @@
+<% link_to "Home", "/" %>
diff --git a/spec/conformance/fixtures/rules/actionview-no-silent-render.html.erb b/spec/conformance/fixtures/rules/actionview-no-silent-render.html.erb
new file mode 100644
index 0000000..d420d57
--- /dev/null
+++ b/spec/conformance/fixtures/rules/actionview-no-silent-render.html.erb
@@ -0,0 +1 @@
+<% render "header" %>
diff --git a/spec/conformance/fixtures/rules/actionview-no-unnecessary-tag-attributes.html.erb b/spec/conformance/fixtures/rules/actionview-no-unnecessary-tag-attributes.html.erb
new file mode 100644
index 0000000..21dfc2e
--- /dev/null
+++ b/spec/conformance/fixtures/rules/actionview-no-unnecessary-tag-attributes.html.erb
@@ -0,0 +1 @@
+<div <%= tag.attributes(class: "box", id: "main") %>></div>
diff --git a/spec/conformance/fixtures/rules/actionview-no-void-element-content.html.erb b/spec/conformance/fixtures/rules/actionview-no-void-element-content.html.erb
new file mode 100644
index 0000000..507389a
--- /dev/null
+++ b/spec/conformance/fixtures/rules/actionview-no-void-element-content.html.erb
@@ -0,0 +1 @@
+<%= tag.hr "divider text" %>
diff --git a/spec/conformance/fixtures/rules/actionview-strict-locals-partial-only.html.erb b/spec/conformance/fixtures/rules/actionview-strict-locals-partial-only.html.erb
new file mode 100644
index 0000000..cf26216
--- /dev/null
+++ b/spec/conformance/fixtures/rules/actionview-strict-locals-partial-only.html.erb
@@ -0,0 +1,3 @@
+<%# locals: (title:) %>
+
+<p>Content</p>
diff --git a/spec/conformance/fixtures/rules/erb-comment-syntax.html.erb b/spec/conformance/fixtures/rules/erb-comment-syntax.html.erb
new file mode 100644
index 0000000..0200c1f
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-comment-syntax.html.erb
@@ -0,0 +1 @@
+<%  # oops this should be an ERB comment %>
diff --git a/spec/conformance/fixtures/rules/erb-no-case-node-children.html.erb b/spec/conformance/fixtures/rules/erb-no-case-node-children.html.erb
new file mode 100644
index 0000000..e5b537e
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-case-node-children.html.erb
@@ -0,0 +1,5 @@
+<% case status %>
+  stray text
+<% when :ok %>
+  fine
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-commented-out-output-tags.html.erb b/spec/conformance/fixtures/rules/erb-no-commented-out-output-tags.html.erb
new file mode 100644
index 0000000..e5fc01d
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-commented-out-output-tags.html.erb
@@ -0,0 +1 @@
+<%#= old_helper %>
diff --git a/spec/conformance/fixtures/rules/erb-no-conditional-html-element.html.erb b/spec/conformance/fixtures/rules/erb-no-conditional-html-element.html.erb
new file mode 100644
index 0000000..07cfdce
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-conditional-html-element.html.erb
@@ -0,0 +1,7 @@
+<% if show %>
+<div>
+<% end %>
+content
+<% if show %>
+</div>
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-conditional-open-tag.html.erb b/spec/conformance/fixtures/rules/erb-no-conditional-open-tag.html.erb
new file mode 100644
index 0000000..9b1b786
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-conditional-open-tag.html.erb
@@ -0,0 +1,7 @@
+<% if active %>
+<div class="a">
+<% else %>
+<div class="b">
+<% end %>
+content
+</div>
diff --git a/spec/conformance/fixtures/rules/erb-no-debug-output.html.erb b/spec/conformance/fixtures/rules/erb-no-debug-output.html.erb
new file mode 100644
index 0000000..558dcbc
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-debug-output.html.erb
@@ -0,0 +1 @@
+<% byebug %>
diff --git a/spec/conformance/fixtures/rules/erb-no-duplicate-branch-elements.html.erb b/spec/conformance/fixtures/rules/erb-no-duplicate-branch-elements.html.erb
new file mode 100644
index 0000000..965667e
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-duplicate-branch-elements.html.erb
@@ -0,0 +1,5 @@
+<% if cond %>
+  <div>A</div>
+<% else %>
+  <div>B</div>
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-empty-control-flow.html.erb b/spec/conformance/fixtures/rules/erb-no-empty-control-flow.html.erb
new file mode 100644
index 0000000..30613b5
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-empty-control-flow.html.erb
@@ -0,0 +1,2 @@
+<% if cond %>
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-empty-tags.html.erb b/spec/conformance/fixtures/rules/erb-no-empty-tags.html.erb
new file mode 100644
index 0000000..52e5ffa
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-empty-tags.html.erb
@@ -0,0 +1 @@
+<%  %>
diff --git a/spec/conformance/fixtures/rules/erb-no-extra-newline.html.erb b/spec/conformance/fixtures/rules/erb-no-extra-newline.html.erb
new file mode 100644
index 0000000..0ca258d
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-extra-newline.html.erb
@@ -0,0 +1,5 @@
+<p>first</p>
+
+
+
+<p>second</p>
diff --git a/spec/conformance/fixtures/rules/erb-no-extra-whitespace-inside-tags.html.erb b/spec/conformance/fixtures/rules/erb-no-extra-whitespace-inside-tags.html.erb
new file mode 100644
index 0000000..4e4f1c6
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-extra-whitespace-inside-tags.html.erb
@@ -0,0 +1 @@
+<%=  name %>
diff --git a/spec/conformance/fixtures/rules/erb-no-inline-case-conditions.html.erb b/spec/conformance/fixtures/rules/erb-no-inline-case-conditions.html.erb
new file mode 100644
index 0000000..6808eb5
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-inline-case-conditions.html.erb
@@ -0,0 +1,3 @@
+<% case status; when :ok %>
+  fine
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-interpolated-class-names.html.erb b/spec/conformance/fixtures/rules/erb-no-interpolated-class-names.html.erb
new file mode 100644
index 0000000..e6b8caf
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-interpolated-class-names.html.erb
@@ -0,0 +1 @@
+<div class="btn-<%= size %>"></div>
diff --git a/spec/conformance/fixtures/rules/erb-no-javascript-tag-helper.html.erb b/spec/conformance/fixtures/rules/erb-no-javascript-tag-helper.html.erb
new file mode 100644
index 0000000..8d3f499
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-javascript-tag-helper.html.erb
@@ -0,0 +1,3 @@
+<%= javascript_tag do %>
+  console.log("hi");
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-output-control-flow.html.erb b/spec/conformance/fixtures/rules/erb-no-output-control-flow.html.erb
new file mode 100644
index 0000000..bb76757
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-output-control-flow.html.erb
@@ -0,0 +1,3 @@
+<%= if cond %>
+  yes
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-output-in-attribute-name.html.erb b/spec/conformance/fixtures/rules/erb-no-output-in-attribute-name.html.erb
new file mode 100644
index 0000000..f28b365
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-output-in-attribute-name.html.erb
@@ -0,0 +1 @@
+<div <%= dynamic_attr %>="value"></div>
diff --git a/spec/conformance/fixtures/rules/erb-no-output-in-attribute-position.html.erb b/spec/conformance/fixtures/rules/erb-no-output-in-attribute-position.html.erb
new file mode 100644
index 0000000..3585cfa
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-output-in-attribute-position.html.erb
@@ -0,0 +1 @@
+<div <%= extra_attrs %>></div>
diff --git a/spec/conformance/fixtures/rules/erb-no-raw-output-in-attribute-value.html.erb b/spec/conformance/fixtures/rules/erb-no-raw-output-in-attribute-value.html.erb
new file mode 100644
index 0000000..976456a
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-raw-output-in-attribute-value.html.erb
@@ -0,0 +1 @@
+<div title="<%== @name %>"></div>
diff --git a/spec/conformance/fixtures/rules/erb-no-silent-statement.html.erb b/spec/conformance/fixtures/rules/erb-no-silent-statement.html.erb
new file mode 100644
index 0000000..5869c7f
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-silent-statement.html.erb
@@ -0,0 +1 @@
+<% track_view %>
diff --git a/spec/conformance/fixtures/rules/erb-no-silent-tag-in-attribute-name.html.erb b/spec/conformance/fixtures/rules/erb-no-silent-tag-in-attribute-name.html.erb
new file mode 100644
index 0000000..d781ce8
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-silent-tag-in-attribute-name.html.erb
@@ -0,0 +1 @@
+<div aria-<% role %>-label="x"></div>
diff --git a/spec/conformance/fixtures/rules/erb-no-statement-in-script.html.erb b/spec/conformance/fixtures/rules/erb-no-statement-in-script.html.erb
new file mode 100644
index 0000000..b35aa01
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-statement-in-script.html.erb
@@ -0,0 +1,3 @@
+<script>
+<% do_something %>
+</script>
diff --git a/spec/conformance/fixtures/rules/erb-no-then-in-control-flow.html.erb b/spec/conformance/fixtures/rules/erb-no-then-in-control-flow.html.erb
new file mode 100644
index 0000000..35aa644
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-then-in-control-flow.html.erb
@@ -0,0 +1,3 @@
+<% if true then %>
+  yes
+<% end %>
diff --git a/spec/conformance/fixtures/rules/erb-no-trailing-whitespace.html.erb b/spec/conformance/fixtures/rules/erb-no-trailing-whitespace.html.erb
new file mode 100644
index 0000000..8e0dce4
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-trailing-whitespace.html.erb
@@ -0,0 +1,2 @@
+<p>Hello   
+</p>
diff --git a/spec/conformance/fixtures/rules/erb-no-unsafe-js-attribute.html.erb b/spec/conformance/fixtures/rules/erb-no-unsafe-js-attribute.html.erb
new file mode 100644
index 0000000..4553f1e
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-unsafe-js-attribute.html.erb
@@ -0,0 +1 @@
+<button onclick="<%= handler %>">Click</button>
diff --git a/spec/conformance/fixtures/rules/erb-no-unsafe-raw.html.erb b/spec/conformance/fixtures/rules/erb-no-unsafe-raw.html.erb
new file mode 100644
index 0000000..1726b8a
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-unsafe-raw.html.erb
@@ -0,0 +1 @@
+<div><%= raw(comment_body) %></div>
diff --git a/spec/conformance/fixtures/rules/erb-no-unsafe-script-interpolation.html.erb b/spec/conformance/fixtures/rules/erb-no-unsafe-script-interpolation.html.erb
new file mode 100644
index 0000000..1bb8509
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-unsafe-script-interpolation.html.erb
@@ -0,0 +1,3 @@
+<script>
+var config = <%= settings %>;
+</script>
diff --git a/spec/conformance/fixtures/rules/erb-no-unused-expressions.html.erb b/spec/conformance/fixtures/rules/erb-no-unused-expressions.html.erb
new file mode 100644
index 0000000..1144dcf
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-unused-expressions.html.erb
@@ -0,0 +1 @@
+<% @user.name %>
diff --git a/spec/conformance/fixtures/rules/erb-no-unused-literals.html.erb b/spec/conformance/fixtures/rules/erb-no-unused-literals.html.erb
new file mode 100644
index 0000000..a260b11
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-no-unused-literals.html.erb
@@ -0,0 +1 @@
+<% "unused" %>
diff --git a/spec/conformance/fixtures/rules/erb-prefer-direct-output.html.erb b/spec/conformance/fixtures/rules/erb-prefer-direct-output.html.erb
new file mode 100644
index 0000000..89385bf
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-prefer-direct-output.html.erb
@@ -0,0 +1 @@
+<%= "hello" %>
diff --git a/spec/conformance/fixtures/rules/erb-prefer-image-tag-helper.html.erb b/spec/conformance/fixtures/rules/erb-prefer-image-tag-helper.html.erb
new file mode 100644
index 0000000..491b4d7
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-prefer-image-tag-helper.html.erb
@@ -0,0 +1 @@
+<img src="<%= @photo %>" alt="pic">
diff --git a/spec/conformance/fixtures/rules/erb-require-trailing-newline.html.erb b/spec/conformance/fixtures/rules/erb-require-trailing-newline.html.erb
new file mode 100644
index 0000000..f55a604
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-require-trailing-newline.html.erb
@@ -0,0 +1,2 @@
+<p>Hi</p>
+
diff --git a/spec/conformance/fixtures/rules/erb-require-whitespace-inside-tags.html.erb b/spec/conformance/fixtures/rules/erb-require-whitespace-inside-tags.html.erb
new file mode 100644
index 0000000..9a472a2
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-require-whitespace-inside-tags.html.erb
@@ -0,0 +1 @@
+<%=x%>
diff --git a/spec/conformance/fixtures/rules/erb-right-trim.html.erb b/spec/conformance/fixtures/rules/erb-right-trim.html.erb
new file mode 100644
index 0000000..6ca0b26
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-right-trim.html.erb
@@ -0,0 +1 @@
+<% x = 1 =%>
diff --git a/spec/conformance/fixtures/rules/erb-strict-locals-comment-syntax.html.erb b/spec/conformance/fixtures/rules/erb-strict-locals-comment-syntax.html.erb
new file mode 100644
index 0000000..7c0bea1
--- /dev/null
+++ b/spec/conformance/fixtures/rules/erb-strict-locals-comment-syntax.html.erb
@@ -0,0 +1 @@
+<% # locals: (name:) %>
diff --git a/spec/conformance/fixtures/rules/herb-disable-comment-malformed.html.erb b/spec/conformance/fixtures/rules/herb-disable-comment-malformed.html.erb
new file mode 100644
index 0000000..ec4af8a
--- /dev/null
+++ b/spec/conformance/fixtures/rules/herb-disable-comment-malformed.html.erb
@@ -0,0 +1 @@
+<div><%# herb:disable foo, %></div>
diff --git a/spec/conformance/fixtures/rules/herb-disable-comment-missing-rules.html.erb b/spec/conformance/fixtures/rules/herb-disable-comment-missing-rules.html.erb
new file mode 100644
index 0000000..85cd8be
--- /dev/null
+++ b/spec/conformance/fixtures/rules/herb-disable-comment-missing-rules.html.erb
@@ -0,0 +1 @@
+<div><%# herb:disable %></div>
diff --git a/spec/conformance/fixtures/rules/herb-disable-comment-no-duplicate-rules.html.erb b/spec/conformance/fixtures/rules/herb-disable-comment-no-duplicate-rules.html.erb
new file mode 100644
index 0000000..d69d3ed
--- /dev/null
+++ b/spec/conformance/fixtures/rules/herb-disable-comment-no-duplicate-rules.html.erb
@@ -0,0 +1 @@
+<div><%# herb:disable parser-no-errors, parser-no-errors %></div>
diff --git a/spec/conformance/fixtures/rules/herb-disable-comment-no-redundant-all.html.erb b/spec/conformance/fixtures/rules/herb-disable-comment-no-redundant-all.html.erb
new file mode 100644
index 0000000..59146a0
--- /dev/null
+++ b/spec/conformance/fixtures/rules/herb-disable-comment-no-redundant-all.html.erb
@@ -0,0 +1 @@
+<div><%# herb:disable all, parser-no-errors %></div>
diff --git a/spec/conformance/fixtures/rules/herb-disable-comment-unnecessary.html.erb b/spec/conformance/fixtures/rules/herb-disable-comment-unnecessary.html.erb
new file mode 100644
index 0000000..9908d27
--- /dev/null
+++ b/spec/conformance/fixtures/rules/herb-disable-comment-unnecessary.html.erb
@@ -0,0 +1 @@
+<div><%# herb:disable svg-tag-name-capitalization %></div>
diff --git a/spec/conformance/fixtures/rules/herb-disable-comment-valid-rule-name.html.erb b/spec/conformance/fixtures/rules/herb-disable-comment-valid-rule-name.html.erb
new file mode 100644
index 0000000..f44d9cd
--- /dev/null
+++ b/spec/conformance/fixtures/rules/herb-disable-comment-valid-rule-name.html.erb
@@ -0,0 +1 @@
+<div><%# herb:disable totally-not-a-real-rule %></div>
diff --git a/spec/conformance/fixtures/rules/html-allowed-script-type.html.erb b/spec/conformance/fixtures/rules/html-allowed-script-type.html.erb
new file mode 100644
index 0000000..014231e
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-allowed-script-type.html.erb
@@ -0,0 +1 @@
+<script type="text/babel">console.log(1)</script>
diff --git a/spec/conformance/fixtures/rules/html-anchor-require-href.html.erb b/spec/conformance/fixtures/rules/html-anchor-require-href.html.erb
new file mode 100644
index 0000000..e16163a
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-anchor-require-href.html.erb
@@ -0,0 +1 @@
+<a>Learn more</a>
diff --git a/spec/conformance/fixtures/rules/html-aria-attribute-must-be-valid.html.erb b/spec/conformance/fixtures/rules/html-aria-attribute-must-be-valid.html.erb
new file mode 100644
index 0000000..b8a8923
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-aria-attribute-must-be-valid.html.erb
@@ -0,0 +1 @@
+<div aria-frobnicate="true">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-aria-label-is-well-formatted.html.erb b/spec/conformance/fixtures/rules/html-aria-label-is-well-formatted.html.erb
new file mode 100644
index 0000000..d56ae11
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-aria-label-is-well-formatted.html.erb
@@ -0,0 +1 @@
+<div aria-label="myLabel">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-aria-level-must-be-valid.html.erb b/spec/conformance/fixtures/rules/html-aria-level-must-be-valid.html.erb
new file mode 100644
index 0000000..f924ed7
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-aria-level-must-be-valid.html.erb
@@ -0,0 +1 @@
+<div role="heading" aria-level="9">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-aria-role-heading-requires-level.html.erb b/spec/conformance/fixtures/rules/html-aria-role-heading-requires-level.html.erb
new file mode 100644
index 0000000..31d460d
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-aria-role-heading-requires-level.html.erb
@@ -0,0 +1 @@
+<div role="heading">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-aria-role-must-be-valid.html.erb b/spec/conformance/fixtures/rules/html-aria-role-must-be-valid.html.erb
new file mode 100644
index 0000000..0836081
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-aria-role-must-be-valid.html.erb
@@ -0,0 +1 @@
+<div role="fizzbuzz">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-attribute-double-quotes.html.erb b/spec/conformance/fixtures/rules/html-attribute-double-quotes.html.erb
new file mode 100644
index 0000000..3ce26f0
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-attribute-double-quotes.html.erb
@@ -0,0 +1 @@
+<div class='wrapper'>Content</div>
diff --git a/spec/conformance/fixtures/rules/html-attribute-equals-spacing.html.erb b/spec/conformance/fixtures/rules/html-attribute-equals-spacing.html.erb
new file mode 100644
index 0000000..4ebc575
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-attribute-equals-spacing.html.erb
@@ -0,0 +1 @@
+<div class ="wrapper">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-attribute-values-require-quotes.html.erb b/spec/conformance/fixtures/rules/html-attribute-values-require-quotes.html.erb
new file mode 100644
index 0000000..cafa5e9
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-attribute-values-require-quotes.html.erb
@@ -0,0 +1 @@
+<div class=wrapper>Content</div>
diff --git a/spec/conformance/fixtures/rules/html-avoid-both-disabled-and-aria-disabled.html.erb b/spec/conformance/fixtures/rules/html-avoid-both-disabled-and-aria-disabled.html.erb
new file mode 100644
index 0000000..56ffb85
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-avoid-both-disabled-and-aria-disabled.html.erb
@@ -0,0 +1 @@
+<button disabled aria-disabled="true">Save</button>
diff --git a/spec/conformance/fixtures/rules/html-body-only-elements.html.erb b/spec/conformance/fixtures/rules/html-body-only-elements.html.erb
new file mode 100644
index 0000000..d89df07
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-body-only-elements.html.erb
@@ -0,0 +1,6 @@
+<html>
+<head>
+<p>Content</p>
+</head>
+<body></body>
+</html>
diff --git a/spec/conformance/fixtures/rules/html-boolean-attributes-no-value.html.erb b/spec/conformance/fixtures/rules/html-boolean-attributes-no-value.html.erb
new file mode 100644
index 0000000..9190a02
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-boolean-attributes-no-value.html.erb
@@ -0,0 +1 @@
+<input disabled="disabled">
diff --git a/spec/conformance/fixtures/rules/html-details-has-summary.html.erb b/spec/conformance/fixtures/rules/html-details-has-summary.html.erb
new file mode 100644
index 0000000..4e90180
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-details-has-summary.html.erb
@@ -0,0 +1,3 @@
+<details>
+<p>Content</p>
+</details>
diff --git a/spec/conformance/fixtures/rules/html-head-only-elements.html.erb b/spec/conformance/fixtures/rules/html-head-only-elements.html.erb
new file mode 100644
index 0000000..0353fe0
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-head-only-elements.html.erb
@@ -0,0 +1,6 @@
+<html>
+<head></head>
+<body>
+<base href="/">
+</body>
+</html>
diff --git a/spec/conformance/fixtures/rules/html-iframe-has-title.html.erb b/spec/conformance/fixtures/rules/html-iframe-has-title.html.erb
new file mode 100644
index 0000000..eaa96f6
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-iframe-has-title.html.erb
@@ -0,0 +1 @@
+<iframe src="https://example.com"></iframe>
diff --git a/spec/conformance/fixtures/rules/html-img-require-alt.html.erb b/spec/conformance/fixtures/rules/html-img-require-alt.html.erb
new file mode 100644
index 0000000..47afe54
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-img-require-alt.html.erb
@@ -0,0 +1 @@
+<img src="logo.png">
diff --git a/spec/conformance/fixtures/rules/html-input-require-autocomplete.html.erb b/spec/conformance/fixtures/rules/html-input-require-autocomplete.html.erb
new file mode 100644
index 0000000..6c92fdc
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-input-require-autocomplete.html.erb
@@ -0,0 +1 @@
+<input type="email">
diff --git a/spec/conformance/fixtures/rules/html-navigation-has-label.html.erb b/spec/conformance/fixtures/rules/html-navigation-has-label.html.erb
new file mode 100644
index 0000000..47f176d
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-navigation-has-label.html.erb
@@ -0,0 +1 @@
+<nav>Content</nav>
diff --git a/spec/conformance/fixtures/rules/html-no-abstract-roles.html.erb b/spec/conformance/fixtures/rules/html-no-abstract-roles.html.erb
new file mode 100644
index 0000000..29b5eb0
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-abstract-roles.html.erb
@@ -0,0 +1 @@
+<div role="widget">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-no-aria-hidden-on-body.html.erb b/spec/conformance/fixtures/rules/html-no-aria-hidden-on-body.html.erb
new file mode 100644
index 0000000..59a0793
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-aria-hidden-on-body.html.erb
@@ -0,0 +1,3 @@
+<body aria-hidden="true">
+  <p>Content</p>
+</body>
diff --git a/spec/conformance/fixtures/rules/html-no-aria-hidden-on-focusable.html.erb b/spec/conformance/fixtures/rules/html-no-aria-hidden-on-focusable.html.erb
new file mode 100644
index 0000000..fddfa8f
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-aria-hidden-on-focusable.html.erb
@@ -0,0 +1 @@
+<a href="/somewhere" aria-hidden="true">Go</a>
diff --git a/spec/conformance/fixtures/rules/html-no-block-inside-inline.html.erb b/spec/conformance/fixtures/rules/html-no-block-inside-inline.html.erb
new file mode 100644
index 0000000..2665f1d
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-block-inside-inline.html.erb
@@ -0,0 +1 @@
+<span><div>Nested block</div></span>
diff --git a/spec/conformance/fixtures/rules/html-no-duplicate-attributes.html.erb b/spec/conformance/fixtures/rules/html-no-duplicate-attributes.html.erb
new file mode 100644
index 0000000..f8d331a
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-duplicate-attributes.html.erb
@@ -0,0 +1 @@
+<div class="a" class="b">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-no-duplicate-ids.html.erb b/spec/conformance/fixtures/rules/html-no-duplicate-ids.html.erb
new file mode 100644
index 0000000..76dd666
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-duplicate-ids.html.erb
@@ -0,0 +1,2 @@
+<div id="widget">A</div>
+<div id="widget">B</div>
diff --git a/spec/conformance/fixtures/rules/html-no-duplicate-meta-names.html.erb b/spec/conformance/fixtures/rules/html-no-duplicate-meta-names.html.erb
new file mode 100644
index 0000000..56c5fc4
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-duplicate-meta-names.html.erb
@@ -0,0 +1,4 @@
+<head>
+  <meta name="description" content="first">
+  <meta name="description" content="second">
+</head>
diff --git a/spec/conformance/fixtures/rules/html-no-empty-attributes.html.erb b/spec/conformance/fixtures/rules/html-no-empty-attributes.html.erb
new file mode 100644
index 0000000..1ddde5c
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-empty-attributes.html.erb
@@ -0,0 +1 @@
+<div id="">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-no-empty-headings.html.erb b/spec/conformance/fixtures/rules/html-no-empty-headings.html.erb
new file mode 100644
index 0000000..71379cd
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-empty-headings.html.erb
@@ -0,0 +1 @@
+<h1></h1>
diff --git a/spec/conformance/fixtures/rules/html-no-nested-links.html.erb b/spec/conformance/fixtures/rules/html-no-nested-links.html.erb
new file mode 100644
index 0000000..94e2bb5
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-nested-links.html.erb
@@ -0,0 +1 @@
+<a href="/outer"><a href="/inner">Inner</a></a>
diff --git a/spec/conformance/fixtures/rules/html-no-positive-tab-index.html.erb b/spec/conformance/fixtures/rules/html-no-positive-tab-index.html.erb
new file mode 100644
index 0000000..c848485
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-positive-tab-index.html.erb
@@ -0,0 +1 @@
+<div tabindex="5">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-no-self-closing.html.erb b/spec/conformance/fixtures/rules/html-no-self-closing.html.erb
new file mode 100644
index 0000000..a8beed5
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-self-closing.html.erb
@@ -0,0 +1 @@
+<div />
diff --git a/spec/conformance/fixtures/rules/html-no-space-in-tag.html.erb b/spec/conformance/fixtures/rules/html-no-space-in-tag.html.erb
new file mode 100644
index 0000000..3d42051
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-space-in-tag.html.erb
@@ -0,0 +1 @@
+<div  id="x">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-no-title-attribute.html.erb b/spec/conformance/fixtures/rules/html-no-title-attribute.html.erb
new file mode 100644
index 0000000..88a254c
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-title-attribute.html.erb
@@ -0,0 +1 @@
+<div title="Tooltip">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-no-underscores-in-attribute-names.html.erb b/spec/conformance/fixtures/rules/html-no-underscores-in-attribute-names.html.erb
new file mode 100644
index 0000000..feb4491
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-underscores-in-attribute-names.html.erb
@@ -0,0 +1 @@
+<div data_foo="bar">Content</div>
diff --git a/spec/conformance/fixtures/rules/html-no-unescaped-entities.html.erb b/spec/conformance/fixtures/rules/html-no-unescaped-entities.html.erb
new file mode 100644
index 0000000..1a69ddd
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-unescaped-entities.html.erb
@@ -0,0 +1 @@
+<p>1 < 2</p>
diff --git a/spec/conformance/fixtures/rules/html-no-unknown-tag.html.erb b/spec/conformance/fixtures/rules/html-no-unknown-tag.html.erb
new file mode 100644
index 0000000..64f094f
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-no-unknown-tag.html.erb
@@ -0,0 +1 @@
+<widget>Content</widget>
diff --git a/spec/conformance/fixtures/rules/html-require-closing-tags.html.erb b/spec/conformance/fixtures/rules/html-require-closing-tags.html.erb
new file mode 100644
index 0000000..6318b8d
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-require-closing-tags.html.erb
@@ -0,0 +1,4 @@
+<ul>
+  <li>One
+  <li>Two
+</ul>
diff --git a/spec/conformance/fixtures/rules/html-require-script-nonce.html.erb b/spec/conformance/fixtures/rules/html-require-script-nonce.html.erb
new file mode 100644
index 0000000..3f8eeb5
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-require-script-nonce.html.erb
@@ -0,0 +1,3 @@
+<script>
+  console.log("hi");
+</script>
diff --git a/spec/conformance/fixtures/rules/html-tag-name-lowercase.html.erb b/spec/conformance/fixtures/rules/html-tag-name-lowercase.html.erb
new file mode 100644
index 0000000..a83d558
--- /dev/null
+++ b/spec/conformance/fixtures/rules/html-tag-name-lowercase.html.erb
@@ -0,0 +1 @@
+<DIV>Content</DIV>
diff --git a/spec/conformance/fixtures/rules/parser-no-errors.html.erb b/spec/conformance/fixtures/rules/parser-no-errors.html.erb
new file mode 100644
index 0000000..e54a273
--- /dev/null
+++ b/spec/conformance/fixtures/rules/parser-no-errors.html.erb
@@ -0,0 +1 @@
+<div>
diff --git a/spec/conformance/fixtures/rules/source-indentation.html.erb b/spec/conformance/fixtures/rules/source-indentation.html.erb
new file mode 100644
index 0000000..3f5b8fb
--- /dev/null
+++ b/spec/conformance/fixtures/rules/source-indentation.html.erb
@@ -0,0 +1,3 @@
+<div>
+	<span>hi</span>
+</div>
diff --git a/spec/conformance/fixtures/rules/svg-tag-name-capitalization.html.erb b/spec/conformance/fixtures/rules/svg-tag-name-capitalization.html.erb
new file mode 100644
index 0000000..573a99b
--- /dev/null
+++ b/spec/conformance/fixtures/rules/svg-tag-name-capitalization.html.erb
@@ -0,0 +1 @@
+<svg><foreignobject></foreignobject></svg>
diff --git a/spec/conformance/fixtures/rules/turbo-permanent-require-id.html.erb b/spec/conformance/fixtures/rules/turbo-permanent-require-id.html.erb
new file mode 100644
index 0000000..1c2d8c7
--- /dev/null
+++ b/spec/conformance/fixtures/rules/turbo-permanent-require-id.html.erb
@@ -0,0 +1 @@
+<div data-turbo-permanent></div>