Incorrect references for CSS2 table-overflow reftests s-11-1-1b-002 through 004 #62635

Three CSS2 table-overflow reftests appear to have incorrect references:

• s-11-1-1b-002.html
• s-11-1-1b-003.html
• s-11-1-1b-004.html

The test cases themselves exercise useful CSS 2.2 behaviour, but their current references cause conforming output to fail visual comparison.

Tests 003 and 004

s-11-1-1b-003.html and s-11-1-1b-004.html test that overflow:auto and overflow:scroll, respectively, behave as visible on table boxes.

Both currently declare:

<link rel="match" href="s-11-1-1b-001-ref.html">

That reference contains a top caption with a 10px bottom margin. Its square is therefore positioned 25px below the upward-overflow result being tested.

The directory already contains s-11-1-1b-003-ref.html, which reproduces the target geometry using margin-top:-15px. Comparing test 003 against this reference should produce an exact visual match.

Tests 003 and 004 produce identical rendering, as expected, so both can use reference s-11-1-1b-003-ref.html.

Perhaps this is a copy-paste error.

Test 002

s-11-1-1b-002.html tests that overflow:hidden on a table clips at the table box rather than the caption-containing table wrapper.

The target uses a relatively positioned child that overflows downward into space associated with a bottom caption. Correct clipping leaves a 20×20 black square and removes the overflowing red border.

However, s-11-1-1b-002-ref.html contains:

table {
  overflow: hidden;
  border-spacing: 0;
  margin-top: 60px;
}

The target has no equivalent table margin. This places the reference square substantially below the target and makes the comparison fail independently of overflow behavior.

Removing margin-top:60px from the reference produces an exact visual match in my test.