Techniques for ink in an electronic document are described. According to various implementations, techniques described herein provide a rich set of tools which allow a user to markup an electronic document such as a web page, not only in static 2D where the user writes on top of a document, but in dynamic 3D. In addition, when adding 3D elements to an electronic document, the 3D elements are added based on awareness of the content of the electronic document and can adapt its content in relationship to the document.