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Selectors are one of the most important aspects of CSS because they are used to “select” elements on an HTML page so the can be styled.
Sample HTML
<div id=”content”>
<h1> Heading Here </h1>
<p> Lorem ipsum dolor sit amet. </p>
<p>Lorem ipsum dolor <a href=”#”>sit</a> amet.</p>
<div>
<div id=”nav”>
<ul>
<li><a href=”#”>Item 1</a></li>
<li><a href=”#”>Item 2</a></li>
<li><a href=”#”>Item 3</a></li>
</ul>
</div>
<div id=”footer”>
Lorem ipsum dolor <a href=”#”>sit</a> amet.
</div>
</body>
CSS Type Selectors
Type selectors will select any HTML element on a page that matches the selector. In the HTML shown above there are seven HTML elements that could be used as type selectors, includeing <body<, <div>, <h1>, <p>, <ul>, <li> and <a>. For example to select all the <li> elements on the page, the <li> selected is used.
color: blue
}
CSS Class Selectors
Class selectors can be used to select any HTML element that has been given a class attribute. In the HTML sample shown above there are two HTML elements with class attributes <p> and < href =”#”>. To select all instances of the intro class, the .intro selector is used.
font-weight: bold
}
You also can select specific instances of a class by combining type and class selectors. For example, you might want to select the <p> and the <a href=”#”> seperatly. This is done using p.intro and a.intro.
color: red;
}
a.intro {
color: blue;
}
ID Selectors
ID selectors are similar to class selectors. They can be used to select any HTML element that has an ID attribute. However, each ID can be used only once within a document, whereas classes can be used as often as needed. In this CSS, How To Tutorial IDs are used to identify unique parts of the document structure. such as the content, navigation and/or footer. In the HTML sample shown above, there are three IDs: <div id=”content”>, <div id=”nav”>, <div id=”footer”>. To select <div id=”nav”>, the #nav selector is used.
color: blue;
}
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