Users report that the HTML diff view in the forum is inaccurate, often highlighting unrelated text changes due to algorithmic misinterpretation. calmh first shared a screenshot showing a diff that incorrectly linked additions in a new paragraph to existing bullet points, possibly due to multiple edits being merged. zogstrip and codinghorror suggest switching to Markdown view, which is more reliable. calmh confirmed only the last paragraph was added and shared a Markdown diff screenshot showing correct highlighting. Later, mrmowji revived the issue, noting the problem persists — even simple edits like adding or deleting an empty line trigger unnecessary highlighting of multiple lines, indicating the HTML diff remains flawed beyond just this case.
See the screenshot for a diff on an edit I made. Actually multiple edits, which might be a contributing factor, but combined into one historically (I guess due to being within a five minute window or such).
The meat of the edit is the adding of the last paragraph. But the diff algorithm seems to have latched on to some words in that paragraph that are in the first point in the bulleted list and then kept drawing the wrong conclusions.
The markdown view is more reliable 
Yeah, just switch to Markdown view.
Ok, changing the title.
So in this case, just the last para was added? No other edits/changes? Ironically I can’t tell. Can you post a screenshot of the markdown diff?
I know it’s an old thread. But I think this issue hasn’t been resolved yet. And it’s not just the HTML diff. This is from my topic:
As you can see, I just added a new line after the image (hence that ins I guess). But three lines are highlighted which seems unnecessary. The same is true if I delete an empty line; I’ll get a del.
Markdown diff below; the text at the end was added.
