https://chronik.fr/wp-content/plugins/generateperf/js/overlay.js?ver=3.1.2

1(function(window, document) {
2    function removeExistingOverlay() {
3        const existingOverlay = document.querySelector('.overlay');
4        if (existingOverlay) {
5            existingOverlay.parentNode.removeChild(existingOverlay);
6            document.body.classList.remove('overlayed');
7        }
8    }
9
10    function open(content) {
11        removeExistingOverlay();
12        document.body.classList.add('overlayed');
13
14        const overlay = document.createElement('div');
15        overlay.className = 'overlay';
16        overlay.innerHTML = `${content}<span class="close-btn"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 329.3 329" width="32" height="32"><path fill="white" d="M195 165 323 37a21 21 0 1 0-30-31L165 135 36 6A21 21 0 1 0 6 37l128 128L6 293a21 21 0 1 0 30 30l129-128 128 128a21 21 0 0 0 30 0c8-8 8-22 0-30zm0 0"/></svg></span>`;
17        document.body.appendChild(overlay);
18
19        function close() {
20            if (overlay.parentNode) {
21                overlay.parentNode.removeChild(overlay);
22                document.body.classList.remove('overlayed');
23            }
24        }
25
26        overlay.addEventListener('click', function(event) {
27            if (event.target === overlay) {
28                close();
29            }
30        });
31
32        overlay.querySelector('.close-btn').addEventListener('click', function(event) {
33            event.stopPropagation();
34            close();
35        });
36
37        document.addEventListener('keydown', function onEsc(e) {
38            if (e.key === "Escape") {
39                close();
40                document.removeEventListener('keydown', onEsc);
41            }
42        });
43
44        return overlay;
45    }
46
47    window.Overlay = { open };
48})(window, document);