html5: failing upstream html5lib-test

[flavorjones]

Yesterday a test was added upstream to resolve an open question about tree construction:

• original issue and analysis: Compat issue: <div><table><svg><foreignObject><select><table><s> html5lib/html5lib-tests#137
• test for proper behavior: Test <div><table><svg><foreignObject><select><table><s> html5lib/html5lib-tests#163

Gumbo is failing this test: https://github.com/sparklemotion/nokogiri/actions/runs/4822050310/jobs/8588763320

I should have time to work on this today.

[flavorjones]

OK, it looks like the test does not specify appropriate errors. Gumbo parses this correctly (the tree is constructed properly) but emits errors. Here's the failing test output:

Minitest::Assertion: Expected 0 errors for <div><table><svg><foreignObject><select><table><s>, found:
1:1: ERROR: Expected a doctype token
<div><table><svg><foreignObject><select><table><s>
^
1:13: ERROR: That tag isn't allowed here  Currently open tags: html, body, div, table.
<div><table><svg><foreignObject><select><table><s>
            ^
1:33: ERROR: That tag isn't allowed here  Currently open tags: html, body, div, table, svg, foreignobject.
<div><table><svg><foreignObject><select><table><s>
                                ^
1:41: ERROR: That tag isn't allowed here  Currently open tags: html, body, div, table, svg, foreignobject, select.
<div><table><svg><foreignObject><select><table><s>
                                        ^
1:41: ERROR: That tag isn't allowed here  Currently open tags: html, body, div, table, svg, foreignobject.
<div><table><svg><foreignObject><select><table><s>
                                        ^
1:48: ERROR: That tag isn't allowed here  Currently open tags: html, body, div, table.
<div><table><svg><foreignObject><select><table><s>
                                               ^
1:51: ERROR: Premature end of file  Currently open tags: html, body, div, table, s.
<div><table><svg><foreignObject><select><table><s>
                                                  ^.
Expected: 0
  Actual: 7

[flavorjones]

Upstream PR is html5lib/html5lib-tests#166