diff --git a/source b/source index c674496762c..211176d06de 100644 --- a/source +++ b/source @@ -55622,6 +55622,46 @@ interface HTMLButtonElement : HTMLElement {
+
+

To determine if a command is valid for a + target given a command attribute + command and an element target:

+ +
    +

  1. If command is in the Unknown state, then return false.

    2. + +

  2. If command is in the Custom state, then return true.

    3. + +

  3. If target's namespace is not + the HTML namespace, then return false.

    4. + +
  4. +

    If target's popover attribute is not in the + No Popover state, and command is in any + of the following states:

    + +
      +

    • Toggle Popover

      • + +

    • Show Popover

      • + +

    • Hide Popover

      • +
    + +

    then return true.

    +
    5. + +

  5. If this standard does not define is valid command steps for + target's local name, then return + false.

    6. + +

  6. Otherwise, return the result of running target's corresponding is valid + command steps given command.

    7. +
+
+

A button element element's activation behavior given event is:

@@ -55666,31 +55706,9 @@ interface HTMLButtonElement : HTMLElement {

  • Let command be element's command attribute.

    • -

  • If command is in the Unknown state, then return.

    • - -

  • Let isPopover be true if target's popover attribute is not in the No Popover state; otherwise false.

    • - -
  • -

    If isPopover is false and command is not in the Custom state:

    - -
      -

    1. Assert: target's namespace is the - HTML namespace.

      2. - -

    2. If this standard does not define is valid command steps for - target's local name, then - return.

      3. - -

    3. Otherwise, if the result of running target's corresponding is valid - command steps given command is false, then - return.

      4. -
    -
    • +

  • If the result of determining if a command + is valid for a target given command and target is false, then + return.

  • Let continue be the result of firing an