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Add note about recent input to DCLS and CLS dfns. #114

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Add note about recent input to DCLS and CLS dfns. #114

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15 changes: 11 additions & 4 deletions index.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -124,12 +124,19 @@ API does not expose these values.)

* The <dfn export>document cumulative layout shift (DCLS) score</dfn> is the
sum of every <a>layout shift value</a> that is reported inside a single
<a href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context">browsing context</a>.
(The DCLS score does not account for layout instability inside descendant browsing contexts.)
<a for="/">browsing context</a>, ignoring those shifts occuring up to 500ms
after an <a>excluding input</a>. (The DCLS score does not account for
layout instability inside descendant browsing contexts, and deliberately
excludes instablity which is in response to user interaction.)

* The <dfn export>cumulative layout shift (CLS) score</dfn> is the sum of every
<a>layout shift value</a> that is reported inside a <a>top-level browsing context</a>,
plus a fraction (the <a>subframe weighting factor</a>) of each <a>layout shift value</a> that is reported inside any <a href="https://html.spec.whatwg.org/multipage/browsers.html#list-of-the-descendant-browsing-contexts">descendant browsing context</a>.
<a>layout shift value</a> that is reported inside a <a>top-level browsing
context</a>, plus a fraction (the <a>subframe weighting factor</a>) of each
<a>layout shift value</a> that is reported inside any <a
href="https://html.spec.whatwg.org/multipage/browsers.html#list-of-the-descendant-browsing-contexts">descendant
browsing context</a>, ignoring all shifts occuring up to 500ms after an
<a>excluding input</a>. (The CLS score excludes instability which is in
response to user interaction.)

* The <dfn export>subframe weighting factor</dfn> for a <a>layout shift value</a>
in a <a>child browsing context</a> is the fraction of the top-level <a>viewport</a> that is occupied by the <a>viewport</a> of the child browsing context.
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