Bug 1509792 [wpt PR 14231] - Add imageSrcset and imageSizes IDL attri…

…butes to HTMLLinkElement, a=testonly

Automatic update from web-platform-tests
Add imageSrcset and imageSizes IDL attributes to HTMLLinkElement

This feature is behind the Experimental Web Platform feature flag.

Spec PR: whatwg/html#4048

Bug: 813452
Change-Id: I84c58035789b64a311637cebc4672d16661980c2
Reviewed-on: https://chromium-review.googlesource.com/c/1350558
Reviewed-by: Dominic Farolino <domfarolinogmail.com>
Reviewed-by: Kinuko Yasuda <kinukochromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamotochromium.org>
Cr-Commit-Position: refs/heads/master{#610990}

--

wpt-commits: dba9026fee0e7f5294181008a91b18c29030a397
wpt-pr: 14231

UltraBlame original commit: 988fb1f286accc0c15d9fc19410ed514598dfaf7

testing/web-platform/tests/preload/dynamic-adding-preload-imagesrcset.tentative.html

@@ -0,0 +1,321 @@
+<
+!
+DOCTYPE
+html
+>
+<
+script
+src
+=
+"
+/
+resources
+/
+testharness
+.
+js
+"
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+=
+"
+/
+resources
+/
+testharnessreport
+.
+js
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+=
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+js
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+<
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+var
+t
+=
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+(
+'
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+a
+dynamically
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+with
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+works
+'
+)
+;
+<
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+script
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+t
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+step
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+function
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+)
+{
+verifyPreloadAndRTSupport
+(
+)
+;
+var
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+=
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+createElement
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+"
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+)
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+as
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+href
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+imageSrcset
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+png
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+png
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+imageSizes
+=
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+onload
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+1
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+t
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+done
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+)
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+0
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+;
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+body
+.
+appendChild
+(
+link
+)
+;
+}
+)
+;
+<
+/
+script
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+=
+"
+resources
+/
+dummy
+.
+js
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+=
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+d5
+)
+&
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+adding
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+preload
+"
+>
+<
+/
+script
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+<
+/
+body
+>