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[css-masking-1] Defined serialization of 'mask-size' #617

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[css-masking-1] Defined serialization of 'mask-size' #617

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8 changes: 8 additions & 0 deletions css-masking-1/Overview.bs
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Expand Up @@ -760,6 +760,13 @@ See 'background-size' property [[!CSS3BG]] for the definitions of the property v

See the section <a href="#layering">“Layering multiple mask layer images”</a> for how 'mask-size' interacts with other comma-separated mask properties to form each mask layer.

<h4 id="mask-size-serialization">
Serialization of 'mask-size' values</h4>

The [=specified value=] and [=computed value=] of the <<bg-size>> type
always serialize as two values, even when the second value is ''mask-size/auto'',
due to the [[cssom#serializing-css-values|shortest, most backwards-compatible serialization principle]].


## Compositing mask layers: the 'mask-composite' property ## {#the-mask-composite}

Expand Down Expand Up @@ -1493,6 +1500,7 @@ The following changes were made since the <a href="https://www.w3.org/TR/2014/CR
* Clarify 'mask' shorthand behavior on appearance of one <<geometry-box>> and the ''no-clip'' keyword.
* 'mask-mode' on a <a>mask layer image</a> that is a reference to a <a element>mask</a> element with a value of ''match-source'' should take the value of the 'mask-type' property on this <a element>mask</a> element.
* Mapping of boxes for SVG elements with and without associated CSS layout box changed to match mapping in Fill and Stroke spec.
* Defined serialization of 'mask-size' in [[#mask-size-serialization]]. (<a href="https://github.com/w3c/csswg-drafts/issues/7802">Issue 7802</a>)
* Editorial changes.

The following changes were made since the <a href="https://www.w3.org/TR/2014/WD-css-masking-1-20140522/">22 May 2014 Working Draft</a>.
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