I've run into the same problem with IE :-(
I did more or less what Dave suggested (untested, of course!):
var $tmp = $('#some-element')
.append('<div style="position: absolute; width: ' +
$('#some-element').css('font-size') + ';" />')
.find(':last-child')
var fontSizeInPx = $tmp.width();
$tmp.remove();
This would work for other units (i.e. in, pt) and other properties
(text-indent, line-height) too.
Some things to watch out for:
* the element you want to measure must be able to have children (i.e.
not <br />, <img />)
* this method makes the browser to two extra re-flows (I think?)
* make sure the appended div doesn't pick-up any funny business from the
cascade.
Luke
Dave Methvin wrote:
>> Firefox is returning the value in pixels while IE6 is returning
>> the value in ems. Is this a bug?
>
> It's just IE being IE. Other browsers have getComputedStyle which tells
> you the dimensions in pixels. IE has currentStyle; although that does
> tell you the current style (taking the CSS cascade into effect) it
> returns whatever dimensions were given in the style rule. jQuery's
> .css() method uses whatever it's dealt by the browser.
>
> I think I've seen IE hacks where you can put a box around a character
> and then measure the box in pixels to get the font size, but my
> Google-fu is weak at the moment.
>
>
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