HTML's <dialog>
element is a built-in tag to represent a dialog box or modal. It's not just a newer semantic element, it also includes an API and its own special CSS.
Here's a video using <dialog>
in action:
How to use it
To start, we add our <dialog>
HTML:
<dialog>
<h1>Modal Heading</h1>
<p>This is the content for the modal.</p>
</dialog>
This won't yet display any visible content, until we call the dialog's .showModal()
method:
const dialog = document.querySelector('dialog');
// When we want to open...
dialog.showModal();
Calling this method will programmatically add the open
attribute to the element, indicating its state and visibility:
<dialog open>
<h1>Modal Heading</h1>
<p>This is the content for the modal.</p>
</dialog>
It will also add a ::backdrop
pseudo-element element with these default styles to dim the content behind the dialog:
dialog::backdrop {
position: fixed;
top: 0px;
right: 0px;
bottom: 0px;
left: 0px;
background: rgba(0, 0, 0, 0.1);
}
If we add a close button, we can hook up an event handler to call the built-in .close()
method to un-show the dialog and remove the backdrop:
<dialog open>
<h1>Modal Heading</h1>
<p>This is the content for the modal.</p>
<button id="close">Close</button>
</dialog>
const dialog = document.querySelector('dialog');
const btn = document.querySelector('#close');
btn.addEventListener('click', () => {
dialog.close();
});
dialog.addEventListener('close', () => {
// Runs after dialog is closed
console.log('The modal was closed!');
});
The document also includes the close
event which can be leverage to run a custom callback once .close()
is called.
As of 11/21, support is available mainly for Edge, Chrome, and Safari Technology Preview with greater support emerging soon! π
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