


In HTML structure, how to select the first child element with a specific class name through CSS?
Apr 05, 2025 pm 06:24 PMIn HTML structure, precise positioning of the first child element with a specific class name is a common CSS problem, especially when the number of child elements is uncertain. This article will demonstrate through examples how to solve this problem using the advanced features of the CSS selector.
Suppose we have a div
container containing multiple activebar
and item
class elements, and the number of activebar
and item
elements is dynamically changed. Our goal is to select the first item
class element only through CSS.
HTML structure example:
<div class="main"> <div class="activebar"></div> <div class="activebar"></div> <div class="activebar"></div> <div class="item"></div> <div class="item"></div> <div class="item"></div> </div>
The simple first-child
or first-of-type
pseudo-class selector does not apply here, because first-child
only selects the first child element of the parent element, while first-of-type
only selects the first of the same type elements.
Workaround: Use the extended functionality of nth-child
selector. Modern CSS allows the use of complex selectors in nth-child
to define the scope.
The following CSS code allows you to accurately select the first item
element:
.main > .item:nth-child(n of .item) { /* Style rules*/ }
The function of nth-child(n of .item)
is: among all the child elements of .main
element, only those child elements that have the .item
class are considered, and the first one is selected from it ( n
represents the first one). This effectively ignores the activebar
element in it and directly locates the first item
element.
In this way, even if the number of activebar
and item
elements changes, we can always accurately select the first item
element, thereby achieving flexible style control.
The above is the detailed content of In HTML structure, how to select the first child element with a specific class name through CSS?. For more information, please follow other related articles on the PHP Chinese website!

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