- AT-SPI: ROLE_HEADING
- ATK: ATK_ROLE_HEADING
- UA: NSAccessibilityStaticTextRole
- IA2: IA2_ROLE_HEADING
- HTML: <h1>, <h2>, ... , <h6>
MDN will be in maintenance mode for a brief period Wednesday June 3, from around 2:30 PM until no later than 4:00 PM Pacific (in UTC, Wednesday June 3, 9:30 PM to 11:00 PM). There should be no disruption in service.