The domInteractive read-only property returns a DOMHighResTimeStamp representing the time immediately before the user agent sets the document's readyState to "interactive".

Measuring DOM processing time may not be consequential unless your site has a very large HTML source to a construct a Document Object Model from.

If there is no parser-blocking JavaScript then the DOMContentLoaded event (see domContentLoadedEventStart for the timestamp) will fire immediately after domInteractive.

A DOMHighResTimeStamp representing the time immediately before the user agent sets the document's readyState to "interactive".

The domInteractive property can be used to log the time when the DOM construction has finished and interaction with it is possible.

Example using a PerformanceObserver, which notifies of new navigation performance entries as they are recorded in the browser's performance timeline. Use the buffered option to access entries from before the observer creation.

const observer = new PerformanceObserver((list) => {
  list.getEntries().forEach((entry) => {
    console.log(
      `${entry.name}: domInteractive time: ${entry.domInteractive}ms`,
    );
  });
});

observer.observe({ type: "navigation", buffered: true });

Example using Performance.getEntriesByType(), which only shows navigation performance entries present in the browser's performance timeline at the time you call this method:

const entries = performance.getEntriesByType("navigation");
entries.forEach((entry) => {
  console.log(`${entry.name}: domInteractive time: ${entry.domInteractive}ms`);
});

• Document.readyState