90131 - Should apply dotted bottom border to dfn[title]

Status: RESOLVED WONTFIX

(Core :: CSS Parsing and Computation, enhancement, P1)

Description

[Matthew T (active 1999-2002)]

To reproduce:
1.  Open <http://bugzilla.mozilla.org/showattachment.cgi?attach_id=41632>.
2.  Look at the first occurrence of the words `internal' or `outbound'.

What you should see:
*   The words have a dotted underline.

What you actually see:
*   They don't.

In bug 56702, I suggested that any element with a `title' attribute get a 
dotted underline, to indicate that hovering over it would show a tooltip with 
the `title' contents. (This would not normally show for images, since they 
would be drawn over the top of the underline.)

Because we don't currently have dotted underline support, border-bottom was 
used instead, and it was applied only to ABBR and ACRONYM elements. I think it 
should apply to DFN elements as well.

All that is required here is to change this line in html.css
|
| abbr[title], acronym[title] {
|
to:
|
| abbr[title], acronym[title], dfn[title] {

Comment 1

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Since this is an html.css change, changing to Style System, and assigning to
myself to check it in if we agree to do this.  Ian, what do you think?

Comment 2

[Hixie (not reading bugmail)]

Devil's advocate: Why not em and strong elements too?

Personally I think it would be ok for us to add "dfn" to the list.

Comment 3

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

I guess my inclination is that abbr and acronym are one class of elements, and
that em, strong, dfn, code, samp, kbd, var are another class.  Why just dfn? 
It's used to indicate the defining instance of a term -- the definition is in
the sentence that the term is part of, not in the TITLE attribute.  For example:

  <dfn>Mozilla</dfn> is an open-source web browser, designed for standards
  compliance, performance and portability.

Comment 4

[David Baron :dbaron: (⌚️UTC-4, no longer working on Mozilla)]

Based on my previous comment, which is backed up by ABBR and ACRONYM having two
paragraphs to themselves in http://www.w3.org/TR/html4/struct/text.html#h-9.2.1
, marking WONTFIX.