Extremely weird behavior: IE11 seems to create an invisible tab when scripts are blocked and then allowed - how to fix it?
<p>IE at its best:</p>

<p>There is a USB stick with an HTML document on it. When the user opens it in IE11 and scripts are blocked, a prompt appears to allow those scripts to run.</p>

<p><a href="https://i.stack.imgur.com/4O0dl.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4O0dl.png" alt="enter image description here"></a></p>

<p>When you click on allow, the site seems to get reloaded, but it also looks like a new tab is opened/ closed.</p>

<p>As soon as JS is enabled, you get redirected to an online version of the site.</p>

<p>Now, on the site there is a video which starts autoplaying after 10 seconds. But in IE11, a few seconds later the same video starts playing parallely so you here the sound twice.</p>

<p>When you check the DOM and remove the <code>&lt;video&gt;</code> tag (there is only 1), one video stops playing. The one that started later though keeps playing. <strong>Even when I visit another website the video keeps playing.</strong></p>

<p>Only closing the browser stops the video.</p>

<p>This behaviour does not occur when I allow scripts to be executed directly.</p>

<p>Using video.js and jQuery.</p>

<p>Any ideas?</p>