Virtual Tour: Page Jump if embedded via iframe

When a Virtual Tour activity is embedded via iframe at the end of a longer web page, the web page jumps directly down to the iframe when it loads. The exact behavior varies from browser to browser:

Firefox: Jumps directly to the iframe at the bottom when loading.

Chrome: As soon as a piece of the iframe becomes visible, the pages jumps down so far that the whole iframe is visible.

Edge: As soon as a piece of the iframe becomes visible, the page jumps down a bit and back again.

Here is a Test page where I embedded the demo tour.

Otacke maybe tracked down the problem to a JavaScript focus here, which does not seem to be necessary.