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HTMLElement: command event
Baseline 2025
Newly available
Since December 2025, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
The command event of the HTMLElement interface fires on an element that is controlled via a button with valid commandForElement and command values, whenever the button is interacted with (e.g., it is clicked).
js
const popover = document.getElementById("mypopover");
// …
popover.addEventListener("command", (event) => {
if (event.command === "show-popover") {
console.log("Popover is about to be shown");
}
});
It is worth pointing out that command events fire on the element being invoked. If the button is clicked, it will first dispatch a click event which, if canceled, then the command event will not fire and the default behavior will not be run.
In addition to canceling the click event on the button, it is also possible to cancel the command event.
For example:
js
button.addEventListener("click", (event) => {
event.preventDefault(); // the `command` event will never fire
});
js
element.addEventListener("command", (event) => {
event.preventDefault(); // the `command` event fires but the default behavior is canceled
});