Bug 264397

Hi Team,

I came across another failing test on STP182:

Test Case: https://jsfiddle.net/d83gt4d8/16/

^ This fails in Safari but passes in Chrome Canary 121 and Firefox Nightly 121.

Test Case (from commit): https://jsfiddle.net/vo39besy/show

^ Third last and above fails in Safari.

Blink Commit: https://chromium.googlesource.com/chromium/blink/+/502ffded2efe7d27b5e0ec085a47d4764b65c12c

WebKit Source: https://searchfox.org/wubkat/source/Source/WebCore/rendering/RenderBlockFlow.cpp#1593

____

This compiles:

if (!grandchildBox)
        return;
    // Make sure to update the block margins now for the grandchild box so that we're looking at

...

 // If we have a 'clear' value but also have a margin we may not actually require clearance to move past any floats.
    // If that's the case we want to be sure we estimate the correct position including margins after any floats rather
    // than use 'clearance' later which could give us the wrong position.
    if (RenderStyle::usedClear(*grandchildBox) != UsedClear::None && !childBlock.marginBeforeForChild(*grandchildBox))
        return;

______

It progress above test case and it might also progress 'no-clearance-due-to-large-margin.html' on WPT in css2 directory.

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Just wanted to raise, so we can fix it. Adding 'BrowserCompat' since only Safari / WebKit fails it.

Thanks!