Specify an initial appearance for the result:

The "Unified" format shows line numbers by default:

Remove the line numbers from AppearanceElements:

When a notebook contains multiple differing cells in a row, Diff attempts to find the best alignment:

Turning that feature off with DiffAlignmentMethod"SequenceAlignment" will result in two blocks of cells marked as a single change, without inner alignment:

By default, strings are compared as a sequence of characters:

Use DiffGranularity to treat strings as a sequence of lines instead:

When comparing cells, Diff will find style and option changes:

Use DiffIgnore to ignore all style and option changes:

Use DiffIgnore to ignore specific notebook options:

When there are lots of matching elements, Diff does not include them all in the output:

Use DiffIncludeMatchesTrue to store all the matching elements:

DiffIncludeMatches also has an impact on the DiffObject for strings:

Displaying a diff will typically show all the matches included in the DiffObject:

Compare the ExpressionCell rendering of arbitrary expressions:

Compare the InputForm strings of arbitrary expressions:

Diff formats typically use green for additions and red for removals by default:

Use DiffStyle to add styling to particular elements:

Remove the default styling with the setting DefaultDiffStyle  None:

Specify a fixed height for the formatted content:

Automatically shrink the display to fit in a fixed size:

Set Scrollbars  Automatic to show scrollbars when necessary: