User:Chris Chittleborough/CSS-notes

From Wikipedia, the free encyclopedia

[edit] From Wikipedia:Village pump (technical)

CSS setting "background:none"

It's sometimes useful to create tables which have the same background color as surrounding text, but Wikipedia's CSS gives all tables a different background color unless a style="..." attribute is used. The obvious CSS setting, "background-color:inherit" does not work with IE6 and earlier, but IE6 does understand "background: none". See here for an example. Both work in Firefox (of course!); I have not tried any other browsers. I am far from the first to "discover" this, which leads me to my point.

I strongly suggest that the m:Help:Table and/or m:Help:HTML_in_wikitext pages should say something about this. But first, we should check other browsers to see if this "trick" works in them.

Comments, questions and corrections welcome. Cheers, CWC(talk) 08:48, 29 April 2006 (UTC)

I tend to use background: transparent; and it works fine in both IE7 and Firefox. —Locke Cole • t • c 09:13, 29 April 2006 (UTC)

It's also OK in IE6. CWC(talk) 11:04, 29 April 2006 (UTC)

If none and transparent are both valid and synonyms (I'm too lazy to check this) please tell us, none is shorter ;-) -- Omniplex 17:17, 1 May 2006 (UTC)

I've done some reading. The latest CSS 2.1 spec says background: none means background-image: none, whereas background: transparent means background-color: transparent. The spec says a valid declaration for background "first sets all the individual background properties to their initial values, then assigns explicit values given in the declaration". The initial value for background-color is transparent, so none and transparent are equivalent in compliant browers, and even in IE6. Since style attributes override CSS rules, background: none seems to be what we want. Cheers, CWC(talk) 18:35, 1 May 2006 (UTC)

Great, thanks. So "background:transparent" could be used to remove an inherited background colour for a background image, without killing the image. And "none" simply removes both. Greets from the only User css-0 ;-) -- Omniplex 19:32, 1 May 2006 (UTC)

Per CWC's request, I looked at List of indie game developers in Safari v2.0.3 (417.9.2) and saw no problems with the page render. Dread Lord CyberSkull ✎☠ 04:14, 5 May 2006 (UTC)

There also seems to be no problem with Safari v1.3.2 (v312.6). Dread Lord CyberSkull ✎☠ 22:24, 5 May 2006 (UTC)

It's also OK in Konqueror.
I've proposed creating a new CSS class in MediaWiki:Common.css — see MediaWiki_talk:Common.css#Proposal:_class_same-bg. Discussion can continue there. Cheers, CWC(talk) 07:16, 10 May 2006 (UTC)