HTML inert Global Attribute - Playground Example

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<!DOCTYPE html>
<html>
<body>
    <style>
        .modal {
            display: none;
            position: fixed;
            z-index: 1;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgb(0,0,0);
            background-color: rgba(0,0,0,0.4);
            padding-top: 60px;
        }

        .modal-content {
            background-color: #fefefe;
            margin: 5% auto;
            padding: 20px;
            border: 1px solid #888;
            width: 80%;
        }

        .close {
            color: #aaa;
            float: right;
            font-size: 28px;
            font-weight: bold;
        }

        .close:hover,
        .close:focus {
            color: black;
            text-decoration: none;
            cursor: pointer;
        }
    </style>

<!-- Main content -->
<div id="mainContent">
    <h2>Main Content of the Page</h2>
    <p>This content will become non-interactive when the modal is open.</p>
    <button id="openModalBtn">Open Modal</button>
</div>

<!-- The Modal -->
<div id="myModal" class="modal">
    <div class="modal-content">
        <span class="close">&times;</span>
        <h2>Modal Dialog</h2>
        <p>This is a simple modal. You can interact with this content, but not with the main page behind it.</p>
    </div>
</div>

<script>
// Get the modal
var modal = document.getElementById("myModal");

// Get the button that opens the modal
var btn = document.getElementById("openModalBtn");

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks the button, open the modal and make main content inert
btn.onclick = function() {
    modal.style.display = "block";
    document.getElementById("mainContent").setAttribute("inert", "");
}

// When the user clicks on <span> (x), close the modal and remove inert from main content
span.onclick = function() {
    modal.style.display = "none";
    document.getElementById("mainContent").removeAttribute("inert");
}
</script>
</body>
</html>

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