This attribute selector applies the styling rule if the attribute's value contains a specific string. Use the * symbol, followed by the equal sign, followed by the string. Let's look at an example. Suppose we need to style all the anchors that have the href attribute's value and contain the string "w3". Add the following CSS code to the file (don't replace it, add it):
This rule applies a font-style italic (we will discuss this property in detail later in the series) to any anchor element that has the attribute href and contains the string w3. If you open the same page without any modification you will find that the two links to the www.w3.org website have been rendered in italic.
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Style Sheets 
HTML5 Boilerplate Introduction
