10. A method for enabling in-context authoring of substitute content for one or more non-textual objects, comprising: accessing an electronic document including content data that includes sentences and at least one non-textual object contextually placed in a first position within the sentences; and presenting substitute content positioned in the first position within the sentences, wherein the substitute content corresponds to the at least one non-textual object; presenting at least a portion of the sentences positioned adjacent to the first position to enable a user to contextually review the substitute content with respect to the sentences; editing the substitute content positioned in the first position within the sentences and in response to editing commands; and storing the substitute content in the electronic document.
10. A method for enabling in-context authoring of substitute content for one or more non-textual objects, comprising: accessing an electronic document including content data that includes sentences and at least one non-textual object contextually placed in a first position within the sentences; and presenting substitute content positioned in the first position within the sentences, wherein the substitute content corresponds to the at least one non-textual object; presenting at least a portion of the sentences positioned adjacent to the first position to enable a user to contextually review the substitute content with respect to the sentences; editing the substitute content positioned in the first position within the sentences and in response to editing commands; and storing the substitute content in the electronic document. 18. A method according to claim 10 , further comprising: delimiting the substitute content using emphasis selected from the group comprising plain text, background color, background pattern, foreground color, foreground pattern, font type, font size, border, outline, graphical markers, images, audio signals, tactile signals, and programmatic objects.