background-position-001

background-position - ex unit

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Flags
ahem, image
Assertion
ex unit is the 'x-height' of the relevant font. 'em' and 'ex' length values when defining 'font-size' property refer to the computed font size of the parent element.

Source

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
 2 <html>
 3 
 4  <head>
 5 
 6   <title>CSS Test: background-position - ex unit</title>
 7 
 8   <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
 9   <link rel="help" href="http://www.w3.org/TR/CSS21/colors.html#background-properties">
10   <link rel="help" href="http://www.w3.org/TR/CSS21/syndata.html#length-units">
11   <link rel="help" href="http://www.w3.org/TR/CSS21/fonts.html#font-size-props">
12   <meta content="ahem image" name="flags">
13   <meta content="ex unit is the 'x-height' of the relevant font. 'em' and 'ex' length values when defining 'font-size' property refer to the computed font size of the parent element." name="assert">
14 
15   <style type="text/css">
16   html {font: 20px/1 Ahem;}
17 
18   body
19   {
20   background: url("support/1x1-lime.png") repeat-x 0 6.25ex;
21   font-size: 2.5ex;
22   margin: 0px;
23   }
24 
25   #vertical-ruler {margin-top: 1px;}
26 
27   #expected-results
28   {
29   font-family: serif;
30   margin-left: 3em;
31   margin-top: -3em;  
32   }
33   </style>
34 
35  </head>
36 
37  <body>
38 
39   <p id="vertical-ruler"><img src="support/ruler-v-100px-200px-300px.png" width="55" height="350" alt="FAIL"></p>
40 
41   <p id="expected-results">A thin green horizontal line should appear at exactly 200px</p>
42 
43  </body>
44 </html>