2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
11B-407.4.6.2.1 Size and shape. Buttons shall have square shoulders, be ¾ inch (19.1 mm) minimum in their smallest dimension and be raised 1/8 inch (3.2 mm) plus or minus 1/32 inch (0.8 mm) above the surrounding surface.
[2010 ADA Standards] 407.4.6.2.1 Size. Buttons shall be ¾ inch (19 mm) minimum in their smallest dimension.
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