Add test to make sure CSSFontPaletteValuesRule's attributes are readonly
Created attachment 439254 [details] Patch
<rdar://problem/83530165>
This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess
Created attachment 439256 [details] Patch
Committed r283154 (242202@main): <https://commits.webkit.org/242202@main>