.css('marginRight') may not be accurate for negative percent margins in Android 4.0-4.3

[timmywil]

See jquery/jquery#1815

Retrieving negative percent margin-right in Android 4-4.4 may not return expected values. This is unfortunate, but necessary until we drop support for Android 2.3.

[dmethvin]

If we have to choose, maybe we should make Android 2.3 lose this contest?

[AurelioDeRosa]

I'll wait before submitting a PR for this as it seems there is room for discussion.

[AurelioDeRosa]

Any update on this issue?

[AurelioDeRosa]

Friendly ping @dmethvin and @timmywil.

[mgol]

It's Android 4.0-4.3, not 4.4. Android 4.4 doesn't have the Android Browser.

Also, I think you confused the issue a little, @timmywil - it's not Android 2.3 that's the problem here. There's a bug in Android 4.0-4.3 only (it actually worked fine in 2.3): getComputedStyle sometimes returns percents instead of the pixel value for some values. The workaround for this bug causes the issue with negative percent margins but we decided that's a lesser evil, especially that it worked like that for a long time.

This issue is valid, it's something we need to document for Android 4.0-4.3.

[mgol]

This is my PR that fixes the percent-instead-of-pixel bug in Android 4.0-4.3 but causes the one we need to document here: jquery/jquery#1842.

[dmethvin]

Is this something we should even attempt to document?

[mgol]

@dmethvin always asking the difficult questions! 😄

Probably not too many people care about negative percent margins in Android 4.0-4.3. But we don't seem to have many such bugs accepted in various browsers, do we? We might as well document it, at least at https://contribute.jquery.org/wont-fix/.

[dmethvin]

That does sound like a better fit for wont-fix I think. Also, with Google and StaclOverflow I think it is legit to have comments like these act as documentation. We can't have yellow-box warnings sprinkled around every API call for each quirk of particular browsers, and this is an obscure one.

So basically the wont-fix text is something like?

Negative margins on Android 4.0-4.3 browser: These browsers return incorrect values from the DOM getComputedStyle method which causes jQuery to return the wrong value.

[mgol]

@dmethvin Sounds good. And good points. 👍