So, this is my body:
<body>
<div class="s2"><img onClick="document.getElementById('s1').contentWindow.history.back();" class="s2s1" src="Images/back-arrow.svg"></div>
<iframe id="s1" class="s1" src="https://protohub.online/"></iframe>
</body>
And nothing happens when I click the image, even when the iframe has history.