web api static property
PerformanceObserver: supportedEntryTypes static property
Available in workers
The static supportedEntryTypes read-only property of the PerformanceObserver interface returns an array of the entryType values supported by the user agent.
As the list of supported entries varies per browser and is evolving, this property allows web developers to check which are available.
Value
An array of entryType values.
Examples
Using the console to check supported types
To find out which entryType values a browser supports, enter PerformanceObserver.supportedEntryTypes into the console. This will return an array of supported values.
PerformanceObserver.supportedEntryTypes;
// returns ["element", "event", "first-input", "largest-contentful-paint", "layout-shift", "long-animation-frame", "longtask", "mark", "measure", "navigation", "paint", "resource", "visibility-state"] in the main thread in Chrome 129
// returns ["mark", "measure", "resource"] in a worker thread in Chrome 129
Checking for unsupported types
The following function checks for support of an array of possible entry types. The unsupported types are logged to the console, however this information could be logged to client-side analytics to indicate that the particular type could not be observed.
function detectSupport(entryTypes) {
for (const entryType of entryTypes) {
if (!PerformanceObserver.supportedEntryTypes.includes(entryType)) {
console.log(entryType);
}
}
}
detectSupport(["resource", "mark", "first-input", "largest-contentful-paint"]);