Tooltip: Rely on getBoundingClientRect for width and height

[hnrch02]

Fixes #14553.

[cvrebert]

Well, I'm glad this lets us get rid of the weird SVG special-casing.

Should we add a regression unit test for #14553, since none of the existing tests caught it?

[hnrch02]

I was working on one, but I abandoned it because of IE8. I'll look into it more later. If you want to do it, please go ahead.

[fat]

nice work

[hnrch02]

@cvrebert Any idea on how to do a cross-browser compatible unit test? rotate could work but would require a lot of CSS to work properly in all browsers.

[cvrebert]

@hnrch02 My thought was that we should just disable the test in incompatible browsers (which would be only IE8?), like we already do in the SVG tooltip test.

[hnrch02]

@cvrebert Think guarding it by

var style = document.documentElement.style
if ('transform' in style || 'webkitTransform' in style || 'msTransform' in style)

would suffice?

[cvrebert]

Sounds good to me.

[hnrch02]

Working on it.

[hnrch02]

Added a unit test.

[hnrch02]

@cvrebert LGTY?

[cvrebert]

Yep.