function submit_hidden({value = "", placeholder = "Type here, then click submit."} = {}) {
const form = html`<form>
<input type=password name="text">
<button type=submit>Submit</button>
</form>`;
form.text.value = form.value = value;
form.text.placeholder = placeholder;
form.text.addEventListener("input", event => event.stopPropagation());
form.addEventListener("submit", event => {
form.value = form.text.value;
form.dispatchEvent(new CustomEvent("input"));
event.preventDefault();
});
return form;
}