Specify if getComputedTextLength() should return a float or an integer

[tigt]

The getComputedTextLength method (and by proxy, the getSubStringLength method) only specify returning a number in user units. Current implementations differ: Chrome and WebKit return integers, and Firefox and IE/Edge return floats.

It would be better to return a float; depending on viewport dimensions and transformations, an integer can be very inaccurate.

[erikdahlstrom]

The getComputedTextLength method is defined as returning a float value in the IDL.

This sounds more like an implementation issue.

[tigt]

Ah, right you are. Would be nice if it was more explicit in the text, but that's probably up to W3C style. I'll take it up with Chrome and Safari.