IE10 / FF16: uncomment linear-gradient lines in claro/variables.less linear-gradient mixins

[Kenneth G. Franqueiro]

Currently in claro/variables.less, there are lines for the standard (non-vendor-prefixed) linear-gradient property, but they are commented out presumably with the thought that it wasn't approved and no browsers supported the property prefix-less at the time.

However, IE10 *does* support the property prefix-less, as does FF16. Therefore, we should not only uncomment the prefix-less rules, but also likely remove the -ms-linear-gradient lines, since there's no need for it (IE9 doesn't support it, and IE10 supports it sans prefix).

[Kenneth G. Franqueiro]

Marking for 1.8.2 for IE10 support; adding ie10 keyword to hopefully make it stand out more for further backports.

[bill]

Agreed. I wish FF10 supported it too but surely it doesn't, so I guess we need to leave the -moz-linear-gradient rules in there for a while.

And from your lack of comments about webkit, I guess that safari and chrome don't support the new standard yet?

[bill]

In [29886]:

Enable linear-gradient non vendor prefixed rule, now that it's been approved, and remove unneeded -ms-linear-gradient, fixes #16250 on trunk.

[bill]

In [29887]:

Enable linear-gradient non vendor prefixed rule, now that it's been approved, and remove unneeded -ms-linear-gradient, fixes #16250 on 1.8 branch.

[Kenneth G. Franqueiro]

RE comment:2, that's correct, according to MDN and caniuse:

• ​https://developer.mozilla.org/en-US/docs/CSS/linear-gradient#Browser_compatibility
• ​http://caniuse.com/#feat=css-gradients

Note that the table on MDN also notes basic support even in FF 3.6, and Dojo 1.x still supports that as well, so -moz should stay in for that as well as FF10.

Thanks for committing the fixes.

FWIW, I noticed just now that MDN mentions -ms- is technically required if you want to specifically support the IE10 platform previews and consumer preview, but it should be a moot point for IE10 final, and I wouldn't see much point in bloating our CSS just to support beta/preview versions of a browser.

[bill]

Actually the non-prefix version is working for me in IE10 (ie Windows 8) preview release.

Looks like we can get rid of -o-linear-gradient pretty soon too. And I bet Safari and Webkit will come around before the release of Dojo 1.9.

[bill]

Note that this isn't applicable to 1.7 and earlier because they use actual background images for the gradients, rather than CSS gradients.