One thing I find myself frequently needing is a way of previewing what an item will look like in the site view from the admin list or edit view for the item. In J3 there is no built-in preview facility, and the Regular Labs Better Preview extension only works with the built-in components. 

After years of working around this by previewing using a second front-end tab and saving in admin and re-loading in the site window in order to see what it will look like I finally got around to working out how to make a Preview button on the admin page toolbar bring up a preview of the site view of the item in a modal window even if it is not published - much more convenient, and avoids the necessity to publish your work in progress before it is ready.

Previously I discussed a way of hinting to the user that a link would open in a new tab/window by simply using css to append an icon to the link text if the target="_blank" attribute was present. This is all very well, but fails to distinguish between external (off-site) links and links to a new page on the current site. 

One of the main reasons that I'm not converting any of my components to Joomla4 is that I make extensive use of the Bootstrap2 responsive row and column layouts for view. Joomla 4 switched to Bootstrap 4 (or maybe 5) which has changed the way you do a grid layout using container, row and col-xx-N instead of row-fluid and spanN

.Some further musings on Categories and Tags sparked by my need for some of my components to use tags but sometimes to restrict the range of tags that can be selected. This started as a need to simplify the tag inputs for xbFilms and xbBooks where the same group of tags (eg Genres) might be used in both components along with other tags.