The current mobile layout tries to be smart and auto-adjusts certain things in an attempt to make the page more mobile-friendly. However, it doesn't always do a good job and there is no (easily accessible) public documentation that would allow users to understand ahead of time what will happen to specific page content. For example, if you insert a picture and designate it to be 100px wide, you would expect it to be 100px wide. On desktop it is but on mobile it might not be. And the scaling isn't linear. Let's say you specify 100px wide and on mobile it comes out 50px wide. You might think, okay, just make it 200px wide on desktop and then it will be 100px wide on mobile. Nope.
If you really care about creating a good mobile layout, you will need to make that your top priority when creating pages. This is true even if the desktop layout ends-up looking like garbage. The reason is that, although not recommended, you can always apply an enormous amount of CSS/JS customization to get the desktop layout to look good. However, you cannot apply any CSS/JS customization to the mobile layout; not even inline CSS.
That is why I recommend using the apostrophe technique used by Fandom to customize fonts
I think there are some guidelines. The mobile view is built for articles - what means simply flowing text.
Paragraphs, headers, bold and italic, links, simple tables - all usually work fine.
Infobox and quote templates have to be classified as such. Some template types are intentionally omitted - specifically "notice" which is for editor notices. Indeed, image size is sometimes buggy.
The main page has a special separated mobile page because it's not a native article page.
Additional decorations should be added to the desktop view carefully, to ensure they don't ruin the mobile simple view. Colors and fonts shouldn't be a problem if added correctly. But special features like tabbers and collapsibles won't work. Tab-like links to subpages can be used.
Headquarter8302, are you referring to italic and bold fonts? That method works because it gets converted into tags. But that is just about all you can do with text on mobile.
Yes, it works better that way because Fandom knew what tag to convert and what tag to ignore.
Next time, please tag me. It raises my priority upon my email burden
What do you think?