Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The mozbrowsermetachange event is fired when a <meta> element related to web applications is added, removed or changed.

See below for the applicable types.

General info

Specification
Non standard
Interface
CustomEvent
Bubbles
Yes
Cancelable
Yes
Target
<iframe>
Default Action
None

Properties

Property Type Description
target Read only EventTarget The browser iframe
type Read only DOMString The type of event.
bubbles Read only Boolean Whether the event normally bubbles or not.
cancelable Read only Boolean Whether the event is cancellable or not.
details Read only Object A custom object.

details

The details property returns an anonymous JavaScript object with the following properties:

name
A DOMString representing the <meta> name attribute value. This can be viewmode, theme-color, theme-group, or application-name.
content
A DOMString representing the <meta> content attribute value, i.e. the content of the meta tag.
type
A DOMString representing the type of meta change that this event object represents. This can be added, changed, removed, or undefined.
lang Optional
A DOMString representing the <meta> name attribute value, if included. If not included, the value returned is undefined.

Example

var browser = document.querySelector("iframe");

browser.addEventListener("mozbrowsermetachange", function(event) {
  console.log("A meta tag has been " + event.details.type + ". Its name is " +
  event.details.name + ", and its content is " + event.details.content + ".");
});

See also