These days we need to use the most flexible means of sizing elements in our web content. Our websites have to cope with different devices, different resolutions, different user preferences, accessibility, etc...
Step forward em. This can, not only be used for font sizes, but layout too. We are used to sizing elements of our pages using pixels. To be more flexible, and get in the swing of thinking about em instead of pixels, in the early stages we need a converter. Now of course, IE certainly early versions of it need to be covered, if we want our pages to be rendered consistently. For this we should put an * before our properties.
The example below, provides you with a converter and an example of how to use it.
See demo.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Pixel to em calculator</title>
<style type="text/css">
body
{
font-family:Sans-serif;
}
#mainPage
{
margin:0 auto;
width:30.8em;
*width:30em;
}
</style>
<script src="http://www.google.com/jsapi"></script>
<script>
google.load("jquery", "1");
google.load("jqueryui", "1");
</script>
<script>
jQuery(function( $ )
{
$("#button").click(function()
{
$('#emlVal').val(parseFloat($('#pixelVal').val()*0.0625).toFixed(2));
$('#emForIEval').val(parseFloat($('#emlVal').val()*1.1).toFixed(2));
});
});
</script>
</head>
<body>
<div id="mainPage">
Pixel value<br /><input type="text" name="pixelVal" id="pixelVal" /><br />
Em value<br /><input type="text" name="emVal" id="emlVal" /><br />
Em for IE value<br /><input type="text" name="emForIEval" id="emForIEval" /><br />
<input type="submit" value="Submit" id="button" />
</div>
</body>
</html>
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