css-positionsticky test returns true when there is partial support for sticky positioning

[facundocabrera]

Hey,

I'm working with an app which require some kind of "fixed column" support in tables.
The initial idea was simulate the floating column using position: sticky but I found a problem, the test we currently have reports true when there is "partial" support.

Please check this gist where I'll show 2 examples, 1st works "cross-browser", and the second one fails in iOS6 and Chrome Canary.

https://gist.github.com/dendril/7606300#file-sticky-test-html

NOTE: the combination position: sticky; top: x; works without any problem. In my case I found the issue because I'm defining left: x; instead.

[phistuck]

Can you file an issue regarding the partial support in crbug.com? thank you!

[patrickkettner]

done here, please star to help boost up its priority :D

[patrickkettner]

that bug has been updated as fixed - https://code.google.com/p/chromium/issues/detail?id=322972.

@stucox - not sure if we should be returning true or not. I don't think this is as broken as the flexbox stuff, but I think that a vast majority of uses are the standard top down, and therefor unaffected by this (now resolved) bug

[stucox]

May be fixed in Blink but it could be a while before it’s fixed in iOS too – although the bug only occurs in certain conditions and @dendril has shown a workaround.

As @patrickkettner says, position: sticky works for the majority of common use cases in these browsers, so I think Modernizr.csspositionsticky should still return true.

Can we record this issue on caniuse.com?

[patrickkettner]

Sent feedback to @Fyrd, I'll submit a PR adding this to the knownBugs section of the test