1936475 - Firefox honors `margin-top` on <legend> in fieldset, while other browsers do not

Status: NEW

(Core :: Layout: Form Controls, task)

Description

[Daniel Holbert [:dholbert]]

Attachment: testcase 1

[Pretty sure this is a bug in other browsers and Firefox is correct; but I'm starting with a bugzilla.mozilla.org bug to cover the underlying reason behind our difference vs. other browsers in bug 1935129.]

STR:

1. Load attached testcase.

FIREFOX RESULTS:
There's 100px of space between "Text before fieldset" and "Legend"

CHROMIUM/WEBKIT RESULTS:
There's no space between "Text before fieldset" and "Legend"

For some reason, Chromium/WebKit seem to ignore the margin-top on the legend, but they honor margin-top on all other sides.

Comment 1

[Daniel Holbert [:dholbert]]

Filed https://issues.chromium.org/issues/383368170 on this in Chrome.

Comment 2

[Daniel Holbert [:dholbert]]

Filed https://bugs.webkit.org/show_bug.cgi?id=284441 on this in WebKit.

Comment 3

[Daniel Holbert [:dholbert]]

(my Chromium bug report was duped to previously-reported https://issues.chromium.org/issues/41216989 )

Comment 4

[Daniel Holbert [:dholbert]]

[size-estimate "S" assuming we're mostly just getting other browsers to align with our spec-compliant behavior here]