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Expand the size of input fields as they come in focus or are filled with content
Design your controls in two modes: expanded and contracted. As the user taps a contracted control, it expands to its larger size. This can help keeping secondary functions out of the way until the user is in need of them.
Expandable inputs can help unclutter user interfaces by staying out of sight until needed. For multiple purpose user interfaces, it can be helpful to let optional actions, such as searching, posting, or commenting, attract a minimum of attention.