Open Bug 1493561 Opened 3 years ago Updated 2 years ago

non-specified border-width on input element is wide on Ubuntu


(Core :: Layout: Form Controls, defect, P3)

64 Branch



Webcompat Priority revisit
Tracking Status
firefox64 --- affected


(Reporter: karlcow, Unassigned)




(Whiteboard: [webcompat])

This is a spin-off of

0. With Firefox Nightly on Ubuntu
1. Go to
2. Notice how the first 4 digits are not visible at all. (see screenshots on )

On the layout tab, without specifying a border there is:

on macOS:

margin: 0
border: 3px (while the default seems to be 2px ???)
padding: 1px
content: 9px x 13.5px

on Ubuntu reporter screenshot (without specifying border-width)

margin: 0
border: 0 8px 0 8px (!!!!)
padding: 1px
content: 0px x 32px

Once  the reporter specified border-width: 0, 

margin: 0
border: 0
padding: 1px
content: 15px x 18px
Well, it's clearly a bug in the page styling since they specify "width:17px"
on these themed <input>s (which by default has 'box-sizing:border-box') and
the theme may set an *arbitrary* wide padding/border.
Replacing "width:17px" with ""width:1ch; box-sizing:content-box;" is
probably what they intended.  Or simply removing "width:17px" altogether
works too.

That said, I wonder if we should put a cap on themed padding/border values
because of page errors like this.  They do seem too large to be
web-compatible on Ubuntu.
(or simply ignore themed padding/border-width values, which I'm guessing
is what Chrome does)

Migrating Webcompat whiteboard priorities to project flags. See bug 1547409.

Webcompat Priority: --- → ?

See bug 1547409. Migrating whiteboard priority tags to program flags.

Webcompat Priority: ? → revisit
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