To request focus for the tab a user selected in getDisplayMedia(), create a CaptureController, pass it as the controller option, then call controller.setFocusBehavior("focus-captured-surface") after the capture promise resolves. The request can move focus to a captured browser tab or window; it cannot focus a monitor, and the browser may decline the change.
The working pattern
getDisplayMedia() always lets the user choose what to share. Your application can request what should happen to focus once that choice is made, but it cannot silently select a surface or bypass the permission prompt.
async function startCapture() {
const controller = new CaptureController();
const stream = await navigator.mediaDevices.getDisplayMedia({ controller });
const [track] = stream.getVideoTracks();
const surface = track.getSettings().displaySurface;
if (surface === "browser") {
controller.setFocusBehavior("focus-captured-surface");
} else if (surface === "window") {
controller.setFocusBehavior("no-focus-change");
}
return stream;
}The controller is associated with this particular capture because it is supplied in the options object. The returned video track reports the selected surface through displaySurface. A value of browser means a tab, window means an application window, and monitor means an entire display.
Choose the direction of focus
Focus the captured tab or window
Use "focus-captured-surface" when the capture should become the active surface. This is the behavior requested in the common “share a tab, then show that tab” workflow. It is a request to the user agent, not an operating-system guarantee.
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Keep focus where it is
Use "no-focus-change" when your capture application should remain active after the user chooses a surface. This is useful for presenter controls, recording dashboards, and annotation tools that must stay in front.
The draft third value
The current W3C Screen Capture Working Draft also defines "focus-capturing-application", a preference for focusing the application that started capture. The document dated 2026-07-16 is a Working Draft, so treat this value as draft specification text and verify support before relying on it.
When to call setFocusBehavior()
Focus behavior is decided around the capture request. You may set the preference before calling getDisplayMedia(), or once immediately after its promise fulfills. After the browser finalizes its decision, changing the preference is too late.
const controller = new CaptureController();
controller.setFocusBehavior("focus-captured-surface");
const stream = await navigator.mediaDevices.getDisplayMedia({ controller });Setting the preference after unrelated asynchronous work can miss the decision window. In practice, either set it immediately before the call or immediately after the promise resolves and before you perform other capture setup.
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Do not assume the user selected a tab
The picker can return a browser tab, a window, or a monitor. Branch on the track setting if your behavior differs by surface:
const [videoTrack] = stream.getVideoTracks();
const { displaySurface } = videoTrack.getSettings();
switch (displaySurface) {
case "browser":
controller.setFocusBehavior("focus-captured-surface");
break;
case "window":
controller.setFocusBehavior("no-focus-change");
break;
case "monitor":
// A monitor cannot be focused through this API.
break;
}Attempting to apply a focus request to a monitor can raise InvalidStateError. Guard the call with the reported surface type rather than treating every capture as a tab.
Complete example with error handling and cleanup
const startButton = document.querySelector("#start");
const stopButton = document.querySelector("#stop");
const preview = document.querySelector("video");
let stream;
startButton.addEventListener("click", async () => {
if (!navigator.mediaDevices?.getDisplayMedia) {
console.error("Display capture is not available in this browser.");
return;
}
const controller = new CaptureController();
try {
stream = await navigator.mediaDevices.getDisplayMedia({
video: true,
audio: false,
controller
});
const [track] = stream.getVideoTracks();
const surface = track.getSettings().displaySurface;
if (surface === "browser") {
controller.setFocusBehavior("focus-captured-surface");
} else if (surface === "window") {
controller.setFocusBehavior("no-focus-change");
}
preview.srcObject = stream;
await preview.play();
track.addEventListener("ended", () => {
preview.srcObject = null;
stream = undefined;
}, { once: true });
} catch (error) {
if (error.name === "NotAllowedError") {
console.warn("The user cancelled capture or permission was denied.");
} else if (error.name === "InvalidStateError") {
console.error("The focus request was invalid or too late.", error);
} else {
console.error("Display capture failed.", error);
}
}
});
stopButton.addEventListener("click", () => {
stream?.getTracks().forEach(track => track.stop());
preview.srcObject = null;
stream = undefined;
});The click handler matters: display capture requires transient user activation. Start capture directly from a user gesture instead of from a timer, page-load callback, or a later promise chain that no longer has activation.
Requirements and permission behavior
- Secure context: Use HTTPS (or a browser-supported local development origin). Supporting browsers expose the API only in secure contexts.
- Fresh user choice: The browser displays a picker and asks for permission each time. Permission cannot be persisted for silent reuse.
- Transient activation: Call the API from a user action such as a button click.
- User-controlled selection: Options can guide presentation, but they cannot remove the user’s choice or silently force a tab.
- Track inspection: Read
displaySurfaceafter the promise resolves when focus behavior depends on the selected surface.
Why focus may not move
The browser declined the request
The focus setting is conditional. User agents can disable a focus change according to their own security, usability, or platform logic. Your application should continue working if the visible focus transition does not occur.
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The selected surface was a monitor
A monitor is not focusable through setFocusBehavior(). Do not call the method for displaySurface === "monitor".
The preference was set too late
Calling the method well after getDisplayMedia() resolves may have no effect because the decision has already been finalized. Move the call to immediately before the request or immediately after resolution.
The browser does not implement the feature
MDN marks CaptureController and setFocusBehavior() as limited availability and not Baseline. There is no complete version matrix in the available documentation, so test every browser and version you intend to support.
The controller was not passed to getDisplayMedia()
A controller created in JavaScript has no effect unless the same object is included as { controller } in the capture options.
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Feature detection and fallback design
Use capability checks and treat focus as an enhancement:
const canRequestFocus =
typeof CaptureController !== "undefined" &&
typeof CaptureController.prototype.setFocusBehavior === "function";
if (!canRequestFocus) {
// Start capture without a focus preference, or explain the limitation.
const stream = await navigator.mediaDevices.getDisplayMedia({ video: true });
}Even when the method exists, verify the actual result in your target environment. A fallback should still show the local preview, provide an obvious stop button, and avoid assuming that the captured tab became active.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Testing checklist
- Serve the page over HTTPS.
- Start capture from a visible button click.
- Test a browser tab, an application window, and a monitor separately.
- Log
track.getSettings().displaySurfacefor each selection. - Try both focus preferences and observe whether the browser changes the visible active surface.
- Cancel the picker and confirm your UI handles
NotAllowedError. - Stop the track and start a new capture to verify cleanup and the fresh permission flow.
- Repeat on every supported browser because support and user-agent policy vary.
Performance and reliability considerations
The focus request itself is a small preference operation; it does not alter video encoding or network transfer. The expensive work begins after capture, when you preview, record, or transmit the stream. Keep the first capture path short so the focus decision is made promptly, and avoid treating focus as a signal that capture succeeded: rely on the stream and track events for that.
When a track ends because the user presses the browser’s stop-sharing control, remove the preview and release application state. If your application sends the stream to a peer, stop the sender or renegotiate according to that application’s lifecycle. These steps prevent a stale UI from suggesting that a surface is still being captured.
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Or skip the browser setup
If your goal is a server-side image of a webpage rather than an interactive tab capture, ScreenshotNeo makes one request and returns a PNG, JPEG, WebP, or PDF. It is not a replacement for getDisplayMedia() when you need live user-selected screen content, but it avoids browser automation for repeatable webpage screenshots.
Use the API documentation at https://screenshotneo.com/docs/ for authentication and options. A cURL request is:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);ScreenshotNeo accepts cookie and consent banners before capture and removes more than 60 known consent platforms, newsletter popups, and chat widgets. Bot checks, blank pages, timeouts, failed loads, and cache hits are not billed, and response headers identify the page verdict and billing status. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients. The Free plan includes 1,000 screenshots per month without a card; paid plans start at $5 for 3,000 shots. Create a free ScreenshotNeo account.
Frequently Asked Questions
Can I force focus without asking the user to choose a surface?
No. getDisplayMedia() requires a user-controlled picker and permission prompt; focus behavior only requests what happens after that choice.
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Continue using the returned MediaStream and report capture state from track events. Focus is conditional and may be refused by the browser.
Does this API focus an entire monitor?
No. A monitor is not a focusable captured surface for setFocusBehavior(), and calling it for a monitor can produce InvalidStateError.
Quick Recap
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