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[css-view-transitions-1] Add a rendering-characteristic note about out-of-viewport elements #10616

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Jul 25, 2024
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[css-view-transitions-1] Add a rendering-characteristic note about out-of-viewport elements #10616

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[css-view-transitions-1] Add a rendering-characteristic note about ou…
noamr Jul 24, 2024
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noamr Jul 24, 2024
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7 changes: 7 additions & 0 deletions css-view-transitions-1/Overview.bs
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Expand Up @@ -1770,6 +1770,12 @@ urlPrefix: https://wicg.github.io/navigation-api/; type: interface;
However, the captured image should include, at the very least, the contents of |element| that intersect with the [=snapshot containing block=].
Implementations may adjust the rasterization quality to account for elements with a large [=ink overflow area=] that are transformed into view.

* Implementations may also adjust the rasterization quality for elements whose [=ink overflow rectangle=] does not intersect with the [=snapshot containing block=].
To avoid a broken experience if the element ends up becoming visible, the captured image should include, at the very least, some low-quality representation of the contents rather than transparent pixels.

Note: This allows efficiency in resource usage and rasterization performance for elements that are away from the viewport and might not become visible at all,
while maintaining a visual effect close enough to the author's intent.

* [=list/For each=] |descendant| of [=shadow-including descendant=] {{Element}} and [=pseudo-element=] of |element|,
if |descendant| is [=captured in a view transition=],
then skip painting |descendant|.
Expand Down Expand Up @@ -1979,6 +1985,7 @@ Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230
* Fix algorithm for dispatching updateDOMCallback promise.
* Scope view transition names to matching tree context. See <a href="https://github.com/w3c/csswg-drafts/issues/10145">issue 10145</a>.
* Fix scoping to match name instead of element. See <a href="https://github.com/w3c/csswg-drafts/issues/10145">issue 10145</a>.
* Add a rendering characteristics note about out-of-viewport elements. See <a href="https://github.com/w3c/csswg-drafts/issues/8282">issue 8282</a>.

<h3 id="changes-since-2022-05-25">
Changes from <a href="https://www.w3.org/TR/2023/WD-css-view-transitions-1-20230525/">2022-05-25 Working Draft</a>
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