Basic and Advance CSS Examples and Concepts Question: Download Cascading Style Sheet CSS PDF
How To Use Class Selectors to Differentiate Tag Instances in CSS?
Answers:
Answer #1A more reliable way to identify tag instances is to use the class attributes and class selectors. In the CSS example below, class="url" is added to <P> tags for Web addresses, with a new CSS definitions using a class selector "P.url". All three selectors match the Web address text, but the class selector "P.url" wins because of the cascading order rules. So you will see Web addresses in bold "sans-serif":
Answer #2<html><head>
<title>CSS Included</title>
<style type="text/css">
/* matches P instances with class="url" only */
P.url {margin-top: 0px; margin-left: 20px;
font-family: sans-serif; fond-weight: bold}
/* matches P instances inside TABLE only */
TABLE P {margin-top: 0px; margin-left: 40px;
font-family: serif; font-size: 12pt; color: blue}
/* matches all instances of tag P */
P {font-family: arial; font-size: 14pt; color: black}
</style>
</head><body>
<p>Welcome to GlobalGuideLine.com resource listings:<br>
<table>
<tr><td><p class="url">www.w3.org</p></td>
<td><p>W3 home page.<p></td></tr>
<tr><td><p class="url">www.php.net</p></td>
<td><p>PHP home page.<p></td></tr>
<tr><td><p class="url">www.google.com</p></td>
<td><p>Google search.<p></td></tr>
</table>
</body></html>
Note that Web address is displayed in blue. Why? Because color is not defined with "P.url", so "TABLE P" wins the color definition.
<title>CSS Included</title>
<style type="text/css">
/* matches P instances with class="url" only */
P.url {margin-top: 0px; margin-left: 20px;
font-family: sans-serif; fond-weight: bold}
/* matches P instances inside TABLE only */
TABLE P {margin-top: 0px; margin-left: 40px;
font-family: serif; font-size: 12pt; color: blue}
/* matches all instances of tag P */
P {font-family: arial; font-size: 14pt; color: black}
</style>
</head><body>
<p>Welcome to GlobalGuideLine.com resource listings:<br>
<table>
<tr><td><p class="url">www.w3.org</p></td>
<td><p>W3 home page.<p></td></tr>
<tr><td><p class="url">www.php.net</p></td>
<td><p>PHP home page.<p></td></tr>
<tr><td><p class="url">www.google.com</p></td>
<td><p>Google search.<p></td></tr>
</table>
</body></html>
Note that Web address is displayed in blue. Why? Because color is not defined with "P.url", so "TABLE P" wins the color definition.
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