[Webkit-unassigned] [Bug 284441] WebKit ignores margin-top on 'legend' element (in fieldset)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=284441

--- Comment #1 from Karl Dubost <karlcow at apple.com> ---
This is even more interesting, because the margin is not added visually, but it is here in the getComputedStyle. 

```
window.getComputedStyle(document.querySelector('legend')).marginTop
# reports 100px
```

padding on the other end is taken into account on all sides. 

In `RenderBox.cpp` there is a special case for Legend, inside
`bool RenderBox::sizesLogicalWidthToFitContent(SizeType widthType) const {… }`
https://searchfox.org/wubkat/rev/a6aecb7cb3614074b11d5db8390698e4ef53b110/Source/WebCore/rendering/RenderBox.cpp#2956-2961

```
    // Button, input, select, textarea, and legend treat width value of 'auto' as 'intrinsic' unless it's in a
    // stretching column flexbox.
    // FIXME: Think about block-flow here.
    // https://bugs.webkit.org/show_bug.cgi?id=46473
    if (logicalWidth.isAuto() && !isStretchingColumnFlexItem() && element() 
         && (is<HTMLInputElement>(*element()) 
         || is<HTMLSelectElement>(*element()) 
         || is<HTMLButtonElement>(*element()) 
         || is<HTMLTextAreaElement>(*element()) 
         || is<HTMLLegendElement>(*element()))
        ) {
        return true;
       }
```

and in html.css

```
legend {
    padding-inline-start: 2px;
    padding-inline-end: 2px;
    border: none;
}
```

Ah probably more interesting `isLegend()` 
https://searchfox.org/wubkat/search?q=symbol:_ZNK7WebCore12RenderObject8isLegendEv&redirect=false
which triggers specific rules for layout computations including.
https://searchfox.org/wubkat/search?q=isExcludedAndPlacedInBorder&redirect=false

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