Why are there so many DOM errors?

I will give information about why there are so many errors.

MentionBB uses DOM Manipulation to manage plugins. This system is very similar to jQuery. It has almost the same methods. append(), prepend() etc. This way the whole page can be edited. All you need is an "html class/id/data". As far as I know, this system only works on MentionBB, so it's a first PR.

BUT the biggest shortcoming of this system is that the DOM is actually very primitive. In fact, there is only HTML4 support, and that is quite limited. Besides, we wouldn't want to use pre-existing HTML4 in a modern system, would we? To prevent this, I used masterminds/html5-php for a long time, I still use it, and without them this system would not exist. Of course there is no dom-manipulation that I mentioned in this repo, it is just a parser. But with PHP 8.4 we will finally be able to use HTML5 without adding an external repo, but that is still in its early stages. Still, I added this for MentionBB. So there are 2 parsers.

BUT 2. When adding this new content (coming from the plugin) to the desired location, we use a method: appendXML(). This is the source of the problem.

https://github.com/mentionbb/mentionbb/blob/master/src/App/Hook/DomManipulation/DomManipulation.php#L127

Because this method does not recognize HTML5, in fact this method was made only for XML. So how do we add new content? I've already tried a bunch of new methods.

At first I tried to change the content only with preg_replace but that made it even worse. Then I opened the content from the plugin with Dom and edited and saved it. But it was too slow.

Then I had a bright idea. Add all the content as HTML comments and then edit it on the main page. At this point, this system is already working great but we need more testing and debugging.

For this reason, do not forget to report any errors you see to me on the Github page: https://github.com/mentionbb/mentionbb/issues/new/choose

https://github.com/mentionbb/mentionbb/commit/21bd23d3108b2d4e7437392ed47889008c44efdd
https://github.com/mentionbb/mentionbb/commit/ef1a255f4079e224c64dd1873eed9f2bb7c2ba9b