Check if the browser is compatible with the FREEZE and RESUME lifecycle events

Is there a method to determine if a browser is capable of registering the freeze and resume lifecycle events?

Even after checking with Modernizr, a reliable JS library, it appears that these events are not supported.

Although extremely beneficial, Safari and Firefox do not currently support these events based on CanIUse data.

Are there alternative approaches to achieve this?

document.addEventListener('onfreeze', (event) => {
    console.log('Frozen');
});

document.addEventListener('onresume', (event) => {
    console.log('Resumed');
});

Answer №1

One traditional method of detecting event support is to search for onxyz members on the source objects. In this case, it seems applicable as well. The specification outlines the onfreeze and onresume members of the Document:

The Page Lifecycle incorporates the following additions:

partial interface Document {
    attribute EventHandler onfreeze;
    attribute EventHandler onresume;
    readonly attribute boolean wasDiscarded;
};

Therefore, using if ("onfreeze" in document) will indicate whether the environment supports the freeze event (and similarly for resume, assuming they are either both supported or neither).

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