Comparison output of electronic documents

A non-transitory machine-readable medium including instructions, which when executed by a machine cause the machine to perform operations comprising:

• presenting a user interface including a plurality of thumbnails that represent pages of a first electronic document;
• receiving a first selection of a thumbnail of a page from the plurality of thumbnails;
• receiving a second selection of the page that is displayed based on the first selection of the thumbnail, the second selection triggering a single comparison of the page;
• in response the second selection of the page represented by the selected thumbnail, performing the single comparison between the first electronic document and a second electronic document;
• and
• performing a mapping, based on the single comparison, to generate more than one markup document, a first markup document of the more than one markup document including at least one annotation that includes changes to the first electronic document relative to the second electronic document and wherein a second markup document of the more than one markup document includes at least one annotation of changes to the second electronic document relative to the first electronic document, the changes identified in the first markup document and the changes identified in the second markup document being a logical inversion relative to each other.

A non-transitory machine-readable medium comprising:

• a first electronic document that includes an embedded second electronic document;
• a list of difference data identifying at least one difference between the first electronic document and the embedded second electronic document that is derived from a single comparison between the first electronic document and the embedded second electronic document created in response to a first selection of a thumbnail of a page from the plurality of thumbnails and a second selection of the page that is displayed based on the first selection of the thumbnail, the second selection triggering the single comparison of the page represented by a selected thumbnail from a user interface that included a plurality of thumbnails representing pages of the first electronic document;
• a first markup document of a first electronic document, which is derived from the single comparison between the first electronic document and the embedded second electronic document, the first markup document comprising an annotation that identifies a change to the first electronic document as compared to a second electronic document;
• and
• a second markup document of the second electronic document, which is derived from the single comparison between the first electronic document and the embedded second electronic document, the second markup document comprising a different annotation that identifies a change to the embedded second electronic document as compared to first electronic document, the annotation and the different annotation being a logical inversion of each other.