Tips for effectively utilizing conditional comments

Is it possible to address all IE bugs by writing CSS in just one conditional block?

<!--[if lt IE 9]>
    <link href="ie.css" rel="stylesheet" type="text/css" />
<![endif]-->

If I use a single conditional comment for IE versions less than 9, can I include CSS specific to IE7 and IE8 in the same stylesheet or do I need separate stylesheets for each version?

Answer №1

In order to apply different stylesheets for each version of Internet Explorer, a unique conditional statement must be created for each one, linking to the corresponding stylesheet. The lt attribute stands for 'less than', while the lte attribute represents 'less than or equal'.

<!--[if IE 7]>
    <link href="ie7.css" rel="stylesheet" type="text/css" />
<![endif]-->

<!--[if IE 8]>
    <link href="ie8.css" rel="stylesheet" type="text/css" />
<![endif]-->

<!--[if IE 9]>
    <link href="ie9.css" rel="stylesheet" type="text/css" />
<![endif]-->

Alternatively, if you wish to use the same stylesheet for all versions of Internet Explorer up to and including version 9, you can utilize the following code:

<!--[if lte IE 9]>
    <link href="ie.css" rel="stylesheet" type="text/css" />
<![endif]-->

Answer №2

When you place content inside a conditional comment, it will only be recognized by specific browsers. This allows you to include multiple link-tags within one conditional comment; however, in this scenario, all tags will be read by IE versions 5,6,7, and 8. If you require separate stylesheets for each version, you must use individual conditional comments for each.

For further insights, check out the following blog post:

This technique can assist in streamlining your use of conditional comments.

edit:

Here's a demonstration:

HTML:

<!--[if IE]><html class="ie"><![endif]-->
<!--[if !IE]><!--><html><!--<![endif]-->
<head></head>
<body>
<h1>Foo!</h1>
</body>
</html>

CSS:

h1{
  font-size:2em;
}

.ie h1{
  /* This rule applies exclusively to Internet Explorers - across all versions */
  font-size:1.5em;
}

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