I will know the tiddler that the anchor is on, so I can make the link of the form http://wiki.html#tiddlername but is there a way to go all the way to the anchor within that tiddler?
Not really.
You can have links within a tiddler to an anchor point as outlined in tiddlywiki.com/#Anchor Links using HTML.
I know it’s been talked about before and I think someone made an extension, but it was a long time ago and I never tested it.
There is a PR, but no recent review. Feat: allow link to section mark by linonetwo · Pull Request #7744 · TiddlyWiki/TiddlyWiki5 · GitHub
I’m an active developer, so only need people comment on this PR and push it to be merged. We are below Obsidion on this part for at least 5 years.
So when that makes it into release, then URLs of the form http://wiki.html#tiddlername^anchorid would work?
Currently I have worked around this by linking to tiddlers because luckily every one of my anchors is a row in a table which is made up from a field of td elements transcluded from a tiddler and the tiddler text itself transcludes that same set of cells putting on its own header row. But this means you cannot see neighboring items in the table, since it only opens the row’s tiddler and not the table’s tiddler.
Yes, it should open the tiddler if it isn’t open. And jump to the anchor, even the anchor is transcluded.
You could try it in the demo link on that PR. And if it doesn’t works, I can fix it.