HTML stalled DOM Event: Reference and Examples

When someone interacts with a webpage, the browser sends events to the relevant JavaScript code. The stalled event happens when the browser expects media data but none arrives.

When stalled happens

The browser expects media data but none arrives.

You can listen for it using addEventListener(). That keeps event handling separate from HTML attributes such as onclick and works well with modern code organization.

A small working example

<video id="demo-target" controls preload="metadata" width="320">
    <source src="sample-video.mp4" type="video/mp4">
</video>
<p id="event-status" role="status">Waiting for stalled...</p>
<script>
    const eventTarget = document.getElementById("demo-target");
    const eventStatus = document.getElementById("event-status");

    if (eventTarget) {
        eventTarget.addEventListener("stalled", (eventDetails) => {
            eventStatus.textContent = "stalled event received";
            console.log(eventDetails.type, eventDetails.target);
        });
    }
</script>

Reading the code

The browser listens for stalled on the relevant target. When the event occurs, the callback receives eventDetails, updates the status message and logs the event name and target in Developer Tools.

Throttle the network while media streams; occurrence is not guaranteed.

To test this example, put a real supported media file at the shown path. Events tied to buffering or download behavior may not fire in the same order on every connection. An unavailable sample file is not proof that your event listener is broken.

Try it in your browser

Open the page, show the Console panel, and follow this test: Throttle the network while media streams; occurrence is not guaranteed. Then change one thing in the example and observe whether the event still fires.

Common Beginner Mistakes

• Expecting stalled to fire without its required user action or browser condition.
• Throttle the network while media streams; occurrence is not guaranteed.
• Adding repeated event listeners without considering cleanup or unwanted side effects.

Key Takeaways

• stalled reports the browser expects media data but none arrives.
• addEventListener("stalled", ...) listens for the event on the appropriate target.
• Throttle the network while media streams; occurrence is not guaranteed.