v152 · css · installed apps

window-drag

The standardized window-drag CSS property lets installed desktop web apps mark custom titlebar regions as draggable window movement areas, replacing legacy app-region naming with move and none.

concepts

  1. Support matrix

    Probe CSS.supports() for standardized window-drag values and legacy app-region aliases.

  2. Custom titlebar safe zones

    Toggle a draggable titlebar region while keeping ordinary buttons explicitly set to window-drag: none.

  3. Inheritance and overrides

    Show the inherited move region and the nested controls that opt out with none.

why it shipped

The CSSWG resolved to standardize this installed-app titlebar behavior under the clearer window-drag name while Chromium keeps legacy app-region and -webkit-app-region mappings for compatibility.

references