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negativeelement will be focusable, but it should not be reachable via sequential keyboard navigation
0element will be focusable and reachable through keyboard sequential navigation, but it's relative order is defined by the platform convention
positiveelement must be focusable and accessible via sequential keyboard navigation; it's relative order will be defined by the attribute value: the sequential follow the increasing number of the tabindex


The maximum value for tabindex should not exceed 32767 as per W3C section 17.11.1 Unless specified default value is -1

An element with a value of 0, an invalid value, or no tabindex value should be placed after the elements with a positive index in the sequential order of keyboard navigation.

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