3. The method of claim 1 , wherein: for a document content element of the document content that is affected by first and second visual styles of the visual style set that overlap, each style element of the first and second visual styles comprises a respective priority indicator; and displaying the document user interface comprises selecting style elements from the first and second visual styles based on the respective priority indicators and displaying the document display portion based on the selected style elements, wherein the selected style elements comprise a first style element from the first visual style and a second style element from the second visual style.
3. The method of claim 1 , wherein: for a document content element of the document content that is affected by first and second visual styles of the visual style set that overlap, each style element of the first and second visual styles comprises a respective priority indicator; and displaying the document user interface comprises selecting style elements from the first and second visual styles based on the respective priority indicators and displaying the document display portion based on the selected style elements, wherein the selected style elements comprise a first style element from the first visual style and a second style element from the second visual style. 4. The method of claim 3 , wherein the document content element is a cell of a table, the first visual style is a table column style, and the second visual style is a table row style.