<dialog closedby>Limited availability
The closedby HTML attribute for <dialog> sets which user actions close a dialog. For example, closedby="any" allows the dialog to be closed by clicking outside of it.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–133Not supported
134+Supportedsince Mar 4, 2025
Current: 155Edge
12–133Not supported
134+Supportedsince Mar 6, 2025
Current: 154Firefox
1–140Not supported
141+Supportedsince Jul 22, 2025
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–133Not supported
134+Supportedsince Mar 4, 2025
Current: 155Firefox Android
4–140Not supported
141+Supportedsince Jul 22, 2025
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Safari, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: closedBy.
Feature detection
JS · check before using
if ("HTMLDialogElement" in globalThis && "closedBy" in HTMLDialogElement.prototype) {
// HTMLDialogElement.closedBy is available
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (2). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| HTMLDialogElement.closedBy | 134 | 134 | 141 | ✕ | 134 | 141 | ✕ |
| dialog.closedby | 134 | 134 | 141 | ✕ | 134 | 141 | ✕ |