Why Doesn't My :first-child Selector Work on My h1 Element?

:first-child Selector Not Selecting the Desired Element

When attempting to select the first h1 element within a div with the class name "detail_container," some users may encounter unexpected behavior. The intended CSS rule, ".detail_container h1:first-child," fails when the h1 element is not the immediate first child of the div.

This issue arises because the :first-child selector applies to the first direct child of its parent element. In the provided example, where the h1 element follows a ul list, the first child of the detail_container div is the ul, not the h1. Consequently, the :first-child selector does not match the h1.

To address this, consider using the :first-of-type selector instead. This selector matches the first element of a given type within its parent, regardless of whether it is the immediate first child. The following CSS rule would select the first h1 element within the div:

.detail_container h1:first-of-type {
    color: blue;
}

However, due to browser compatibility limitations, it is recommended to use a designated class for the first h1 element and target that class instead:

.detail_container h1.first {
    color: blue;
}

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