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[css-text-decor-3] Specify animation addition/accumulation behavior for text-shadow #4375

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[css-text-decor-3] Specify animation addition/accumulation behavior for text-shadow #4375

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Specify animation addition/accumulation behavior for text-shadow
stephenmcgruer Sep 26, 2019
6928794
Tweak wording to show that accumulation performs addition on the comp…
stephenmcgruer Sep 26, 2019
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18 changes: 18 additions & 0 deletions css-text-decor-3/Overview.bs
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Expand Up @@ -24,6 +24,8 @@ Use <i> Autolinks: yes
<pre class="link-defaults">
spec:css-break-3; type:dfn; text:fragment
spec:css-display-3; type:property; text:display
spec:infra; type:dfn; text:list
spec:web-animations-1; type:dfn; text:composite operation
</pre>

<h2 id="intro">
Expand Down Expand Up @@ -886,6 +888,22 @@ Text Shadows: the 'text-shadow' property</h2>
<code>::first-line</code> and <code>::first-letter</code>
pseudo-elements.

<h3 id="combining-text-shadows">Addition and accumulation of text-shadows</h3>

<a lt="composite operation">Composition</a> of text-shadow values when animating
follows the same model as 'box-shadow', as follows:

<a lt="value addition">Addition</a> of two text-shadow lists
<var>V<sub>a</sub></var> and <var>V<sub>b</sub></var> is defined as [=list=]
concatenation such that <var ignore>V<sub>result</sub></var> is equal to
<var>V<sub>a</sub></var> [=list/extended=] with <var>V<sub>b</sub></var>.

<a lt="value accumulation">Accumulation</a> of two text-shadow lists
<var>V<sub>a</sub></var> and <var>V<sub>b</sub></var> follows the padding rules
for interpolation as defined in the <b>Animation type</b> section of
'text-shadow'. Instead of interpolating, however, accumulation performs
addition on each component according to its type.

<h2 id="painting">
Painting Text Decorations</h2>

Expand Down