What are cons to use % over em in terms of accessibility?
+1
A:
I don't think there are any any more.
In the olden days, internet explorer wouldn't let you zoom a page if sizes were specified in pixels, but would if in em or %. This led to the recommendation to stay away from pixels in order to allow users to view content at a size useful for them.
Nowadays, all modern browsers do a full page zoom, irrespective of what units you use to size things in, so basically it's up to you.
I often use pixels when things need to be perfectly lined up, and em when sizing fonts and paragraph margins etc to keep a vertical rhythm.
Rich Bradshaw
2010-01-24 09:46:33
A:
% over em?
I would say no advantage concerning accessibility as far as I know, but I would say it is hard to switch from one to the other.
Isn't '%' a relational size, whereas 'em' is an absolute size? The one is for liquid layouts, the other isn't...
Jongsma
2010-01-24 09:54:18
`em`s are relative too. 1 em = the width of an "M"
nickf
2010-01-24 09:54:55
Well, yes and no... Neither is absolute, but they're based on different things. % is relative to the user's *window* size and em is relative to the user's *font* size.
Dave Sherohman
2010-01-24 10:04:21