Pop-up Window

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Full Title or Meme

The use of Pop-up Windows in Browsers, especially modal windows, has led to a wide variety of attacks on the user's Attention.


  • Many malicious attackers were able to take-over a user's Browser experience until they clicked on a link which caused an undesirable result for the user.
  • The only way out was to shut down the browser which most users would not expect or attempt.

Blink-dev Status

Mason Freed <masonf@chromium.org> Wed, Aug 3, 11:18 AM (2 days ago) to blink-dev

Contact emails masonf@chromium.org

Explainer https://open-ui.org/components/popup.research.explainer


Summary An API that can be used to build transient user interface (UI) elements that are displayed on top of all other web app UI. These include user-interactive elements like action menus, form element suggestions, content pickers, and teaching UI. This API uses a new `popup` content attribute to enable any element to be displayed in the top layer. This is similar to the <dialog> element, but has several important differences, including light-dismiss behavior, pop-up interaction management, animation and event support, and the lack of a "modal" mode.

TAG review https://github.com/w3ctag/design-reviews/issues/743

TAG review status Pending


  1. Interoperability and Compatibility

Gecko: No signal

WebKit: No signal

Web developers: No signals

Other signals:

WebView application risks

  1. Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

Goals for experimentation

  1. Validation of the shape and ergonomics of the overall pop-up API. Feedback should include use cases that do not work well (or that do work particularly well), performance issues, etc. Ideally, use cases should include as much of the API as possible, including multiple pop-up types (auto, hint, manual), nested pop-ups, declarative and imperative pop-up invocation, etc.


  1. A feature has been added to devtools which shows all of the elements that are currently in the top layer, plus annotations of those elements in the Elements tree. Elements that use the pop-up API will be shown with this feature.

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes

Is this feature fully tested by web-platform-tests? Yes

Flag name

  1. enable-experimental-web-platform-features

Requires code in //chrome? False

Tracking bug https://crbug.com/1307772

Estimated milestones

OriginTrial desktop last	110
OriginTrial desktop first	106
OriginTrial Android last	110
OriginTrial Android first	106
OriginTrial webView last	110
OriginTrial webView first	106

Link to entry on the Chrome Platform Status https://chromestatus.com/feature/5463833265045504

Links to previous Intent discussions Intent to prototype: https://groups.google.com/a/chromium.org/g/blink-dev/c/9y-Thg9UCxY/m/_4gShWjQAAAJ

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAM%3DNeDjJOC2%2B5aHfAoN8wOx8T0gtm%3D-o6eNK5XD6Ps5iRet6zA%40mail.gmail.com.