Bug 263679

Description:

The following two tests are constantly failing on macOS ToT and since 269753@main:

http/tests/css/link-css-disabled-value-with-slow-loading-sheet.html
http/tests/css/link-css-disabled-value-with-slow-loading-sheet-in-error.html


This issue can be bisected to 269753@main by using the command: 
run-webkit-tests --exit-after-n-failures 1 --debug http/tests/css/link-css-disabled-value-with-slow-loading-sheet-in-error.html

History:
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=http%2Ftests%2Fcss%2Flink-css-disabled-value-with-slow-loading-sheet-in-error.html&test=http%2Ftests%2Fcss%2Flink-css-disabled-value-with-slow-loading-sheet.html&flavor=wk1&version_name=Sonoma&version_name=Ventura

Text Diff: 
66Testing value of 'disabled' prior to load just after setting them
77PASS mainSheetLink.sheet is null
8 PASS alternateSheetLink.sheet is non-null.
8FAIL alternateSheetLink.sheet should be non-null. Was null
99PASS mainSheetLink.disabled is true
1010PASS alternateSheetLink.disabled is false
1111Testing the values when the alternate sheet is loaded (as this is the only one that has sheet() === null)
  

Link:
https://build.webkit.org/results/Apple-Ventura-Release-AppleSilicon-WK1-Tests/269753@main%20(5838)/http/tests/css/link-css-disabled-value-with-slow-loading-sheet-in-error-actual.txt