2022 California Standards for Accessible Design Guide (effective January 1, 2023)
11B-707.6.1 Input controls.
At least one tactilely discernible input control shall be provided for each function. Where provided, key surfaces not on active areas of display screens, shall be raised above surrounding surfaces. Where membrane keys are the only method of input, each shall be tactilely discernible from surrounding surfaces and adjacent keys.
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