The “Be Mean to Opera” Hack

This hack can be used to hide CSS from Opera (versions 5 and below):

html>body .myDiv { m\yProperty: myval; }

IE5/win and Opera 3-5 suffer from the same CSS parsing bug that is exploited in Tantek’s Box Model Hack. (Without Tantek’s hack, real-world CSS development would be much harder.) The Tantek hack has a “Be Nice to Opera” rule that allows developers to filter out Opera and simply target their CSS to correct IE5/win’s broken box model. To specifically target Opera, though, developers need to modify the “Be Nice to Opera” rule using the Simplified Box Model Hack. For example, using the following CSS, only Opera 3-5 will display the div.myDiv using red text.

div.myDiv {<br />
&nbsp;&nbsp;&nbsp;&nbsp;color: black;<br />
}<br />
html&gt;body div.myDiv {<br />
&nbsp;&nbsp;&nbsp;&nbsp;color: red;<br />
&nbsp;&nbsp;&nbsp;&nbsp;c\olor: black; /* be ~mean~ to Opera -- http://www.albin.net/css/be_mean_to_opera */<br />
}

What the heck does that mean? The “Be Mean to Opera” selector means: “select the div.myDiv descendent of the body element if the body element is a child of the html element.” Since the body element is always a child of the html element, this rule can be modified to match anything inside the body element.

IE/win (versions 6 and below) don’t support CSS2’s child selector and, thus, will ignore the entire html>body rule. Opera (versions 5 and before) will ignore the property that has an escape (\) character in it. Any letter G-Z can be escaped with a backslash (\) without affecting it’s meaning. In other words, ‘\g’ will be read by a non-buggy CSS parser as ‘g’. Don’t escape the letters A-F; they are interpreted as hexidecimal numbers when escaped (‘\f’ means ‘15’ in hexidecimal). Opera 6, IE5/Mac, IE6/win, Netscape 6, and Mozilla all have CSS parsers that interpret escaped characters correctly; all but IE6/win (because of it’s lack of support for CSS2’s child selector) will read the html>body { c\olor: black; } property.

Written by John on Monday, June 10, 2002 - 12:36pm.

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Comment by Maik Beken (not verified) on Tue, 2008/07/08 - 5:20am.

The comma-separated values (or CSV; also known as a comma-separated list or comma-separated variables) file format is a file type that stores tabular data. The format dates back to the early days of business computing. For this reason, CSV files are common on all computer platforms.
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The “Be Mean to Opera” Hack

Comment by Multiblock (not verified) on Fri, 2008/07/25 - 2:36pm.

very usefull thing!
but what is CSV?

CSV

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CSV files you can open with openoffice...

Is it formally known as the

Comment by wow gold (not verified) on Fri, 2008/08/01 - 9:22am.

Is it formally known as the "Be Nice to Opera Rule"? Talk about patronising.

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Comment by anthem blue cross california (not verified) on Mon, 2008/08/11 - 7:38am.

Thanks, John. Nice to know that some people are actually considering Opera. Surprised me.

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Comment by CyberGhost (not verified) on Fri, 2008/08/22 - 3:07am.

is a Concurrent Versions System, if you did not misspelled it.
More here: http://en.wikipedia.org/wiki/Concurrent_Versions_System
If you really mean CSV, then a comment below already described it.

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The “Be Mean to Opera” Hack

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