Sunday, May 19, 2024
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HTML popover Attribute

Modals have been an vital a part of web sites for 20 years. Stacking contents and utilizing fetch to perform duties are an effective way to enhance UX on each desktop and cell. Sadly most builders do not know that the HTML and JavaScript specs have applied a local modal system by way of the popover attribute — let’s test it out!


Making a native HTML modal consists of utilizing the popovertarget attribute because the set off and the popover attribute, paired with an id, to establish the content material component:

  "popovertarget" attribute will map to "id" of popover contents
<button popovertarget="popover-contents">Open popover</button>
<div id="popover-contents" popover>That is the contents of the popover</div>

Upon clicking the button, the popover will open. The popover, nonetheless, won’t have a conventional background layer shade so we’ll must implement that on our personal with some CSS magic.


Styling the contents of the popover content material is fairly commonplace however we are able to use the browser stylesheet selector’s pseudo-selector to model the “background” of the modal:

/* contents of the popover */
[popover] {
  background: lightblue;
  padding: 20px;

/* the dialog's "modal" background */
[popover]:-internal-popover-in-top-layer::backdrop {
  background: rgba(0, 0, 0, .5);  

:-internal-popover-in-top-layer::backdrop represents the “background” of the modal. Historically that UI has been a component with opacity such to indicate the stacking relationship.

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