Modality

Best practices

• Use a sheet only when the task is self-contained and short, and return people to where they were.
• One sheet at a time. A choice inside a sheet uses a popover or a pop-up button, never another sheet. A long side task means the sheet should have been a page.
• Every modal view has an obvious way out: Cancel, the close button and Escape.
• Popovers hold a few related controls or a short explanation. One at a time; never a popover on a popover (R10).
• Confirm before discarding edits, never before closing an untouched sheet.