166-how-to-click-programmatically-button-inside-iframe/iframe1.html at master · createit-dev/166-how-to-click-programmatically-button-inside-iframe · GitHub

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<!-- iframe1.html -->
<html>
<head>
    <style>
        body {
            background:yellowgreen;
        }
        #myDIV{
            background:yellow;
            border:3px solid brown;
            padding:50px;
            margin:10px 0;
        }
    </style>
</head>
<body>
<h1>Iframe content</h1>
<button type="button" id="toggleDivButton" onclick="toggleDiv()">Toggle div</button>
<div id="myDIV" style="display:none;">Hidden content</div>

<script>
    function toggleDiv() {
        var x = document.getElementById("myDIV");
        if (x.style.display === "none") {
            x.style.display = "block";
        } else {
            x.style.display = "none";
        }
    }
</script>
</body>
</html>