IE-only supports <comment> tag

• Component: DOM
• Status: RESOLVED INVALID

[jasneet]

I Steps:
Go to 
http://classadnew.sina.com.cn/user/info_fix.php?f_city=556&f_id=1624659
Scroll to the end of the page.

II Issue:
Extra content is showing up in center column before footer.

III Conclusion:
Only IE supports (non-standard) <comment> tag.

IV Other browsers:
IE7: ok
FF3: not ok
Opera9.24: not ok

V Nightly tested: 31386

[jasneet]

Created attachment 20170 [details]
screenshot

[jasneet]

Created attachment 20171 [details]
reduction

[Robert Blaut]

Since it's non-standard element and also not supported by other browsers (except IE) there is no reason to implement it.

[Peter Kasting]

Sure there is: site compat.  A good reason _not_ to implement would be "doing this will break x, y, and z".

Obviously there's an opportunity to evangelize the site to only use standards-compliant tags, but that doesn't also preclude consideration of support for this IE-ism if it increases real-world compat and doesn't break things.

[Robert Blaut]

Confirmed as an evangelism bug.

[Dave Hyatt]

This is trivial to support.  The danger in supporting it would be with tag misnesting, since an error in closing the tag could result in a pretty catastrophic rendering failure.  We'd have to make sure we understood IE's error resolution for the tag before turning it on.

comment { display: none } in the CSS file is all that is required to implement this.

[Dave Hyatt]

Given that Firefox and Opera don't support it, it's hard to imagine that this is that important though.

[Darin Fisher (:fishd, Google)]

hyatt:  note the domain of the problem site.  no browser except IE has marketshare in china.

[Ahmad Saleem]

No the browser support it event today (Safari 15.6, Chrome Canary 106 and Firefox Nightly 104). I think this can be marked as "RESOLVED WONTFIX"? Thanks!