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Oglacs
Universal Selectors
These selectors as mentioned above, select every element on a page and apply the styling properties. As for instance, the following rule says that every element on the page will be given a solid 1 pixel black border
* {
border: 1px solid #000000;
}
Attribute Selectors
These selectors allow selecting elements based on attributes they contain. For example, the following selector shows that you can select every img element with an alt attribute.
img[alt] {
border: 1px solid #000000;
}
By using the above selector, you will be putting a black border around any image that has an alt attribute.
Selecting attributes becomes more useful if you can select them by attribute value instead of just attribute names as given in the example below:
img[src="alert.gif"] {
border: 1px solid #000000;
}
You may think that this is not that useful but it can be useful when it comes to debugging. CSS 3 now introduces three new types of attribute selector that can select based in text strings in attribute values.
Child Selectors
One can use a child selector for selecting specific elements that are children of other specific elements. As for example, the following rule will turn text of strong elements that are children of h3 elements into blue but will cause no effect on other strong elements.
h3 > strong {
color: blue;
}
(Note: Child Selectors are not supported in IE 6 and below)
Descendant Selectors
Similar to child selectors, descendant selectors however only select direct descendants. These selectors select only suitable elements from anywhere in an element hierarchy, not only direct descendants. Look at the following HTML snippet.
<div>
<em>hello</em>
<p>In this paragraph I will say
<em>goodbye</em>.
</p>
</div>
The div element is in this snippet is the parent of all the others. It has two children, em and p. The p element has another single child element, another em.
A child selector can be used to select just the em immediately inside the div as:
div > em {
...
}
But if you use a descendent selector, as give below:
div em {
...
}
Both em elements would be selected.
to be continued... visit back for more or visit Oglacs, the software development company.
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3 comments:
wow! this is great script! can someone find me its source please.
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