Abstract: Annotation methods and systems for supporting the annotation of documents in the format of a rendering engine are provided. The annotation system allows for the adding of annotations to documents, the displaying of annotations over content of the documents, and the displaying of annotations in an annotation pane. To provide annotation support for a document, the annotation system augments the document with elements including an element with annotation engine code and elements to support the collecting and displaying of annotations. When the rendering engine renders the document, it executes the annotation engine code to effect the collecting and displaying of the annotations.