How Does the `content` Property Enable `:before` and `:after` Pseudo-Element Content?

Requirement of the 'content' Property in :before and :after Pseudo-Elements

The :before and :after pseudo-elements allow for the insertion of content before or after an element's content. To display this content, the 'content' property is required.

According to W3C specifications, the generated content is specified using the :before and :after pseudo-elements in conjunction with the 'content' property. This property defines the text or content that will be inserted. If the 'content' property is omitted, the default value of 'none' is assumed, resulting in no content insertion.

The styling applied to pseudo-elements affects the display of the generated content. However, the 'content' property defines this generated content, and without it, the browser assumes 'none,' meaning there is nothing to be styled.

To avoid repeating 'content:""' in multiple places, a global style can be applied to all :before and :after pseudo-elements in the CSS:

::before, ::after {
    content:'';
}

This code ensures that all pseudo-elements have content defined, even if it is an empty string. By adhering to this requirement, developers can effectively utilize the :before and :after pseudo-elements to add additional content or styling to elements.

The above is the detailed content of How Does the `content` Property Enable `:before` and `:after` Pseudo-Element Content?. For more information, please follow other related articles on the PHP Chinese website!