When Hajk is embedded focus should be disabled to prevent the site from "jumping" to the map

[jacobwod]

Describe the bug
Embedded solutions that place the map solution outside of the viewport will automatically scroll down, so that Hajk becomes visible. This is due to an autofocus behaviour.

To Reproduce
Check this out: https://www.halmstad.se/byggaboochmiljo/stadsplaneringochbyggande/detaljplanering/pagaendedetaljplaner.n1202.html

[jacobwod]

Found a solution. Added it to the Wiki.

Short summary: ensure that the Iframe's contents are hidden until loaded by adding the style and onload attributes to your <iframe>:

<iframe
    src="http://hajk.example.com/?m=map_1&x=110045.47067712664&y=6287011.024308603&z=0&l=58,205,100&clean=true"
    style="display: none"
    onload="this.style.display='block';"
  />