Bug 1935213 [wpt PR 49525] - Change parser behavior of <select><select>, a=testonly

Automatic update from web-platform-tests
Change parser behavior of <select><select>

This patch makes the HTML parser convert nested <select> tags into
</select> instead of </select><select> for backwards compatibility with
the old parser. This behavior will apply to any nested selects, such as
<select><div><select>.

This was recommended here:
whatwg/html#10557 (comment)

This will be tested here:
html5lib/html5lib-tests#178 (comment)

Change-Id: I7a39901582b96edc10deca8794b9ce117aa08229
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6040687
Commit-Queue: Joey Arhar <jarharchromium.org>
Reviewed-by: David Baron <dbaronchromium.org>
Cr-Commit-Position: refs/heads/main{#1391787}

--

wpt-commits: c4c67222e7b0677f92f43280837db48473603f1e
wpt-pr: 49525

UltraBlame original commit: 666bbfe1252e12af9394a702ad62918ae14f44c2

Author: marco-c

testing/web-platform/tests/html/semantics/forms/the-select-element/customizable-select/select-parsing.tentative.html

@@ -857,36 +857,24 @@
 !
 !
 outerSelect
-&
-&
-!
-!
-innerSelect
 )
 ;
 assert_equals
 (
-outerSelect
-.
-nextSibling
 innerSelect
+null
 '
 Nested
 select
 should
 be
-pushed
-out
-as
-the
-next
-sibling
+removed
 '
 )
 ;
 assert_equals
 (
-innerSelect
+outerSelect
 .
 nextElementSibling
 nextDiv
@@ -946,19 +934,12 @@
 !
 !
 outerSelect
-&
-&
-!
-!
-innerSelect
 )
 ;
 assert_equals
 (
-outerSelect
-.
-nextSibling
 innerSelect
+null
 '
 Nested
 select