https://pelletkachelforum.nl/wp-content/plugins/nocache-bfcache/js/bfcache-opt-in.js?ver=1.3.1

1/**
2 * Adds a sparkle (✨) button after the "Remember Me" checkbox on the login screen to open a popover with information
3 * about the bfcache opt-in.
4 *
5 * This is a JavaScript module, so the global namespace is not polluted.
6 *
7 * @since 1.1.0
8 */
9
10/**
11 * Script module ID.
12 *
13 * @since 1.1.0
14 * @type {string}
15 */
16const moduleId = '@nocache-bfcache/bfcache-opt-in';
17
18/**
19 * JSON script containing the PHP exports.
20 *
21 * @since 1.0.0
22 * @type {HTMLScriptElement}
23 */
24const jsonScript = /** @type {HTMLScriptElement} */ (
25	document.getElementById( `wp-script-module-data-${ moduleId }` )
26);
27
28/**
29 * Exports from PHP.
30 *
31 * @since 1.1.0
32 * @type {{
33 *     buttonTemplateId: string,
34 * }}
35 */
36const data = JSON.parse( jsonScript.text );
37
38// Add a button that opens a popover with information about the instant navigation feature.
39const p = document.querySelector(
40	'p.forgetmenot:has(> input#rememberme ):has(> label:last-child[for="rememberme"] )'
41);
42if ( p ) {
43	const tmpl = /** @type {HTMLTemplateElement} */ (
44		document.getElementById( data.buttonTemplateId )
45	);
46	const button = /** @type {HTMLButtonElement} */ (
47		tmpl.content.firstElementChild
48	);
49	p.append( button );
50}