Complete CSS Selector Reference
Select and style every <p> element that is the first child of its parent:
The :first-child selector is used to select the specified selector, only if it is the first child of its parent.
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The :first-child selector is supported in all major browsers.
Note: For :first-child to work in IE8 and earlier, a <!DOCTYPE> must be declared.
CSS tutorial: CSS Pseudo classes
Select and style every <i> element of every <p> element, where the <p> element is the first child of its parent:
Select and style the first <li> element in lists:
Select and style the first child element of every <ul> element:
Complete CSS Selector Reference
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