Bug: Support command event

[o-t-w]

command and commandfor attributes were recently added to the HTML spec, along with a new command event. This is supported in Chrome Canary and due to land in Chrome/Edge stable version 135 in March. See this article for a list of the valid commands - the command event should fire for all these commands.

React version: 19

Steps To Reproduce

1. Include the following markup

    <button command="toggle-popover" commandfor="popover">Toggle popover</button>
    <div onCommand={handleCommand} popover="auto" id="popover">popover content</div>

2. Define the handleCommand function

  function handleCommand(event) {
      console.log(`a command happened: ${event.command}`);
  }

3. Open in Chrome Canary and look at the browser dev tools console.

Link to code example: https://codesandbox.io/p/sandbox/distracted-lucy-vlh25y

The current behavior

Errors with the message: "Unknown event handler property onCommand. It will be ignored."

The expected behavior

The command event triggers the event handler.