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LibWeb: Resolve viewport-relative <img sizes> values

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We still don't know how to resolve font-relative lengths in <img sizes>
since we don't always have font size information available at this stage
in the pipeline, but we can at least handle viewport-relative lengths.

This fixes an issue on many websites where low-resolution images were
loaded (appropriate for a small viewport) even when the viewport is big.
This commit is contained in:
Andreas Kling 2023-08-21 12:51:02 +02:00
parent ae5313d33c
commit 0103940cee
4 changed files with 25 additions and 1 deletions
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10
Tests/LibWeb/Ref/img-srcset-viewport-relative-sizes.html Normal file
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@ -0,0 +1,10 @@
<!doctype html>
<img
sizes="100vw"
srcset="
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2P4z8DwHwAFAAH/F1FwBgAAAABJRU5ErkJggg== 100w,
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2NgaGD4DwAChAGAZM0bBgAAAABJRU5ErkJggg== 200w
"
width="400"
height="400"
/>