1. CSS Masks

    Method of displaying part of an element, using a selected image as a mask

  2. css at-rule: `@media`: `display-mode` media feature

  3. css at-rule: `@media`: `display-mode` media feature: `picture-in-picture` value

  4. webapp: display_override: `tabbed` display mode

  5. webapp: display_override: `window-controls-overlay` display mode