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| Thread title: Use of the 'em' unit? |
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09-04-2005, 05:02 PM
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#1
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 Use of the 'em' unit?
Hey, can anyone tell me how the 'em' unit works in HTML/CSS?
For example:
Code:
img {
margin: 0;
padding: 0.4 em;
}
Thanks. 
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09-05-2005, 02:29 AM
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#2
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an 'em' the length of a capital M, it is used so there is a spacing unit relevant to the text size.
So in this case, the padding of the image will be 0.4 % of the width of the letter M in whatever text size has been set.
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09-05-2005, 04:09 AM
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#3
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In other words, don't use it for layout if you want a static design. And when the text size is at normal, I think it's 16px or around that, just to get an idea.
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09-05-2005, 04:45 AM
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#4
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Status: design rockstar
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or resize the text size, so 1em is a useable size.
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09-05-2005, 10:02 AM
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#5
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Originally Posted by Cheyne
... the padding of the image will be 0.4 % of the width of the letter M ...
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In this case, it's actually 40% (0.4). Just to avoid any confusion.
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09-05-2005, 01:02 PM
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#6
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09-06-2005, 07:13 AM
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#7
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Status: Simply to simplify
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dumbcoder, make sure you don't have a space between 0.4 and em like you have above, it should always have no gap between the two.
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09-07-2005, 01:14 PM
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#8
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Personally, I think it best to use points or pixels rather than ems.
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09-07-2005, 03:13 PM
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#9
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pixels is more exact when working with small changes
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09-08-2005, 07:50 AM
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#10
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moped and bennett, pixels and points are too restrictive when you are designing for accessibility. Em gives the text fluidity, which people with poor eyesight need, so they enlarge the text.
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