Errors and User Control

The purpose of this activity is to explore the undo models used in single-user text editing. You will find a few different kinds of textboxes below. Experiment with your web browser's undo model for text editing by typing, deleting, changing properties, and using Undo. Try to figure out:

• how many undo streams are there—one, or many?
• how is the history divided into undoable units?
• how much previous state is recovered when you undo? (selections? cursor positions?)
• what visible feedback does Undo give? (e.g., if the Undo affects a location scrolled out of the box?)

One line, plain text

Multi-line, plain text

Multi-line, rich text

Bold Italic