Document font size vs Canvas font size

[astralaaron]

Is there any reason why 14px text in the document and 14px text in a Canvas element are different? The canvas text is bigger..

[Ingolme]

Are you using the same font?

[astralaaron]

yes same font

[astralaaron]

it is pretty close anyway...but definitely a little different

[Ingolme]

Hmm, I can't say why they're different but I generally don't rely on font sizes being the same in different devices. Perhaps absolute units such as cm or pt would give a more accurate representation.

 

Yes, px is considered a relative unit by the W3C because it depends on the real size of a pixel which is different for every screen though that should mean that 14px should be the same for any application on the same screen.

 

cm isn't very reliable either, I tried to make a box 1cm big and it's actually exactly 9 millimeters so there's a systematic error of 10% on my device. I really don't know what to trust, perhaps checking sizes in a PDF document is a good way to calibrate a computer.

[astralaaron]

Thanks for the info. It's close enough anyway.

 

By the way I forgot to mention, the canvas (marquee with the text) shows in IE9 / IE10, and a marquee element shows in IE7 / IE8. Maybe IE7 / IE8 render px differently