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is use of rem bad?

Sent by Philippe Wittenbergh on 21 July 2016 03:03

> On Jul 21, 2016, at 2:05 AM, John J [EMAIL-REMOVED]> wrote:
> Working on my code, I decided to see what they CSS validator had to say
> about it, and it threw out 154 errors, most of which were about rem as my
> value of measure for things like padding, type, borders, margin.
> I am using rem on advice of a developer who said that a certain pinhead,
> un-named browser needs it; other browsers can use/deal with it too.
> Yet the validator threw a hissy..Should I abandon all efforts to support
> arcane versions of this browser, and stick only with em?

The default configuration of the CSS validator should handle the `rem` unit without any problems
(other wise, make sure “CSS Level 3” is selected under the “more options” disclosure
triangle thingie).

I use rem units all the time for everything and more without trouble. All modern browsers handle
this unit correctly. If you need support for IE 8 – which doesn’t support the `rem` unit, then
what Tom says…

(and note to Karl: no, just blindly replacing `rem` with `em` is _not_ the way to go. The computed
value of something specified with the rem unit is based on the computed value of the font-size as
set on the root element. For the `em unit` it is based on the font-size of the element itself.)

Philippe Wittenbergh

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