checked
menuitem - Boolean attribute which indicates whether the command is selected. May only be used when the <code>type</code> attribute is <code>checkbox</code> or <code>radio</code>. input -
When the value of the <strong>type</strong> attribute is <code>radio</code> or <code>checkbox</code>, the presence of this Boolean attribute indicates that the control is selected by default, otherwise it is ignored.
Unlike other browsers, Firefox will by default <a class="external" href="https://stackoverflow.com/questions/5985839/bug-with-firefox-disabled-attribute-of-input-not-resetting-when-refreshing">persist the dynamic checked state</a> of an <code><input></code> across page loads. Use the <code><a href="/en-US/docs/Web/HTML/Element/input#attr-autocomplete">autocomplete</a></code> attribute to control this feature.