300062 - warn when page uses the id multiple times

Status: RESOLVED WONTFIX

(Core :: DOM: Core & HTML, enhancement)

Description

[Henrik Gemal]

if would be cool if mozilla could warn a user in the javascript console of
multiple use of id's
like the following html:
<div id="test"></div><div id="test"></div>

a warning could be written to the console saying:
"id "test" used multiple times in page at http://test.test.invalid"

Comment 1

[Boris Zbarsky [:bzbarsky]]

Doing this in general would require a performance hit on various DOM operations and pageload that we don't really want.