Bug 1477919 [wpt PR 12154] - url: DecodeURLEscapeSequences() should not apply UTF-8 and isomorphic encoding to a single input., a=testonly

Automatic update from web-platform-testsurl: DecodeURLEscapeSequences() should not apply UTF-8 and isomorphic encoding to a single input.

DecodeURLEscapeSequences() decoded some parts of an input string in UTF-8,
and other parts of the string in isomorphic encoding. This behavior doesn't
make sense, is harmful against browser interoperability, and is used only
in 0.0013% of page views (only in scroll-to-fragment cases).

DecodeURLEscapeSequences() is used in many code paths, and we have usage
data only for scroll-to-framgnet. However this CL tries to remove this
weird behavior entirely.

Bug: 845824
Change-Id: Ib1cbbd3e1c26ebaaca7b3537b9732121835fdc9f
Reviewed-on: https://chromium-review.googlesource.com/1146535
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578151}

--

wpt-commits: c54b4511852cd7acdb0aed4108f38487ab95418f
wpt-pr: 12154

testing/web-platform/meta/MANIFEST.json

@@ -574811,7 +574811,7 @@
    "testharness"
   ],
   "html/browsers/browsing-the-web/scroll-to-fragid/fragment-and-encoding.html": [
-   "c971911f997816b711e634a506178a24c5680401",
+   "21fbd4618da539e7bc7b9939bf8193337cd59e29",
    "testharness"
   ],
   "html/browsers/browsing-the-web/scroll-to-fragid/navigate-helpers.js": [

testing/web-platform/tests/html/browsers/browsing-the-web/scroll-to-fragid/fragment-and-encoding.html

@@ -7,6 +7,7 @@
 <div style=height:10000px></div>
 <div id=&#xFF;></div>
 <div id=&#xFEFF;></div>
+<div id=&#x2661;&#x00FF;><div>
 <script>
 function goToTop() {
   location.hash = "top";
@@ -34,4 +35,16 @@ test(() => {
   location.hash = "%FF";
   assert_equals(self.scrollY, 0, "#%FF");
 }, "%FF should not find U+00FF as decoding it gives U+FFFD");
+
+test(() => {
+  goToTop();
+
+  // U+2661 in UTF-8 + %FF.
+  // Chrome had an issue that the following fragment was decoded as U+2661 U+00FF.
+  // https://github.com/whatwg/html/pull/3111
+  location.hash = "%E2%99%A1%FF";
+  assert_equals(self.scrollY, 0, "%E2%99%A1%FF");
+
+  goToTop();
+}, "Valid UTF-8 + invalid UTF-8 should not be matched to the utf8-decoded former + the isomorphic-decoded latter");
 </script>