The HTML Compare UI allows you to perform a graphical or textual comparison of two file versions. The two files launch in the split-view panes and are labeled Left and Right. The compare tools are located above the left pane.
The HTML Compare feature boasts the following tools:
Overlay - the two files are placed one on top of the other for comparison. Use the slider to change the transparency of the files.
Show Differences - the left file opens overlaid over the right file.
The left file displays in cyan.
The right file displays in red.
Any aspects of the file that are the same will appear in grey.
Side-by-Side - both files are displayed in a split-screen view. Select Left or Right to choose which is the active file that will receive any markups or other changes.
Left Document (Only) - only the file that was first opened displays.
Right Document (Only) - Only the file that was opened for compare is displayed.
Balance - available for Overlay and Overlay Differences to adjust the slider. Moving it to one side or the other will fade out the opposing side's document.
