Why isn't this character-level highlighting?

It compares line by line—good for seeing whole-line adds, deletes, and edits, not intra-line character diffs.

Do whitespace changes count?

Yes. There is no ignore-whitespace option—spaces, indentation, and blank lines all affect the result.

Not yet—the page shows a visual table plus added/removed/changed counts only.

Added

Removed

Changed

Unchanged

Old #

Original

New #

Updated

—

Added

line zero

line one

Unchanged

line one

line two

Changed

line four

line three

Unchanged

line three

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