3. The method of claim 1 , wherein each of the plurality of content items have an asset type selected from a group consisting of text and image.
3. The method of claim 1 , wherein each of the plurality of content items have an asset type selected from a group consisting of text and image. 4. The method of claim 3 , wherein the difference between sizes of each slot in a candidate template and size constraints of one or more of the plurality of content items is based on an aspect ratio of each slot in the candidate template and a minimum or a maximum aspect ratio of content items with an asset image type.