Bug 1610238 [wpt PR 21256] - Relax feature-detection for <menclose>, a=testonly

Automatic update from web-platform-tests
Relax feature-detection for <menclose> (#21256)

Discussion is still open: w3c/mathml#105
so let's only check some minimal <mrow> support.

Igalia does not plan to implement this element in Chromium for now so
making detection too strict is causing test failures.
--

wpt-commits: ee2b3c3d8740dcfccf6d6a0c5a371335dd198654
wpt-pr: 21256

UltraBlame original commit: 636f59cb8640669c6417462eae91bda7fbd29029

Author: marco-c

testing/web-platform/tests/mathml/support/feature-detection.js

@@ -134,239 +134,78 @@ function
 (
 )
 {
-if
-(
-!
-this
-.
-hasOwnProperty
-(
-"
-_has_menclose
-"
-)
-)
-{
-document
-.
-body
-.
-insertAdjacentHTML
-(
-"
-beforeend
-"
-"
-<
-math
->
-\
-<
-mrow
-style
-=
-'
-font
--
-size
-:
-20px
-!
-important
-'
->
-\
-<
-mrow
->
-\
-<
-mrow
->
-\
-<
-mrow
->
-\
-<
-mtext
->
-A
-<
 /
-mtext
->
-\
-<
 /
-mrow
->
-\
+Just
+check
+whether
 <
-/
 mrow
 >
-\
-<
+is
+supported
+because
+discussion
+on
+this
+is
 /
-mrow
->
-\
-<
 /
-mrow
->
-\
-<
-menclose
-notation
-=
-'
-box
-'
-style
-=
-'
-font
--
-size
+still
+open
+(
+https
 :
-20px
-!
-important
-'
->
-\
-<
-menclose
-notation
-=
-'
-box
-'
->
-\
-<
-menclose
-notation
-=
-'
-box
-'
->
-\
-<
-menclose
-notation
-=
-'
-box
-'
->
-\
-<
-mtext
->
-A
-<
 /
-mtext
->
-\
-<
 /
-menclose
->
-\
-<
+github
+.
+com
 /
-menclose
->
-\
-<
+mathml
+-
+refresh
 /
-menclose
->
-\
-<
+mathml
 /
-menclose
->
-\
-<
+issues
 /
-math
->
-"
+105
 )
-;
-var
-math
-=
-document
-.
-body
-.
-lastElementChild
-;
 /
 /
-The
-boxes
-will
-make
-menclose
-wider
-than
+and
+it
+would
+have
+to
+behave
+at
+least
+like
+an
 mrow
+even
 if
+it
+becomes
+/
+/
+an
+unknown
+element
+at
 the
-former
-is
-supported
+end
 .
+return
 this
 .
-_has_menclose
-=
-math
-.
-lastElementChild
-.
-getBoundingClientRect
-(
-)
-.
-width
--
-math
-.
-firstElementChild
-.
-getBoundingClientRect
-(
-)
-.
-width
->
-5
-;
-document
-.
-body
-.
-removeChild
+has_mrow
 (
-math
 )
 ;
 }
-return
-this
-.
-_has_menclose
-;
-}
 "
 has_merror
 "