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Most often selectors will share some of the same styles, for example, being based on the same font.
In these cases, rather than defining the font for each and every selector, one by one, you can group them, and thus assign the font to all the selectors at once.
Look at this example, made without grouping:
.headlines{
font-family:arial; color:black; background:yellow; font-size:14pt;
}
.sublines {
font-family:arial; color:black; background:yellow; font-size:12pt;
}
.infotext {
font-family:arial; color:black; background:yellow; font-size:10pt;
}
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As you can see, the only style that varies is the font-size.
In the next example we have grouped the selectors, and defined the common styles at once.
.headlines, .sublines, .infotext {
font-family:arial; color:black; background:yellow;
}
.headlines {font-size:14pt;}
.sublines {font-size:12pt;}
.infotext {font-size: 10pt;}
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Less to type, easier to change and guaranteed to be the same for all styles.
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"Better Than Books - As Easy As It Gets!"