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How to select an element that does not have a specific class using the :not() pseudo-class?
How to select an element that does not have a specific class using the :not() pseudo-class?
Jul 11, 2025 am 03:22 AM
<p> In CSS, if you want to select an element that does not contain a specific class name (class) , the :not() pseudo-class is a very practical tool. It allows you to exclude elements that match a selector, thereby accurately controlling the scope of style applications.
Basic usage: :not(.class-name)
<p> You can directly use :not(.your-class) to select all elements without this class . For example: p:not(.highlight) {
color: gray;
}<p> The meaning of this code is: in all <p> tags, the text color will turn .highlight .<p> Note: The parentheses of:not()must be a valid selector, and multiple selectors cannot be written unless nested:not()is used.
How to write multiple exclusion conditions?
<p> If you want to exclude multiple classes, such as neither.a nor .b , you can write this: p:not(.a):not(.b) {
font-weight: normal;
}<p> In other words, two "no" conditions must be met at the same time. It cannot be written as p:not(.a, .b) , this writing method is invalid.Practical application scenarios
Scene 1: Set the default style uniformly and exclude special items
<p> For example, in a list, most items have a common style, and only some of them need to be highlighted:<ul> <li class="default">Item 1</li> <li class="default highlight">Item 2</li> <li class="default">Item 3</li> </ul><p> CSS can be written like this:
.default:not(.highlight) {
background-color: #f0f0f0;
}<p> In this way, "Item 1" and "Item 3" will have a light gray background, while "Item 2" will not be selected because of the .highlight class.Scene 2: Form control style processing
<p> Sometimes you want to border all input boxes, but exclude some type: input:not([type="submit"]) {
border: 1px solid #ccc;
}<p> This will make all input boxes except the submit button have borders.Things to note when using
-
:not()will not affect performance, but do not over-neck, otherwise it will be difficult to maintain. - You cannot use pseudo-elements (such as
::before) inside, you can only use pseudo-classes or ordinary selectors. - If the incoming selector itself is invalid, the entire expression will be invalid.
div:not(.class#id) { /* Error syntax*/
...
}<p> Basically that's it.
:not() looks simple, but it can save a lot of trouble when flexibly using it in actual projects. Just remember its limitations and correct writing methods, you can easily achieve the effect of "reverse filtering".The above is the detailed content of How to select an element that does not have a specific class using the :not() pseudo-class?. For more information, please follow other related articles on the PHP Chinese website!
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