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In what order are elements with a tabindex value of 0 focused when the web page is tabbed?
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tabindex="0" means that the element should be focusable in sequential keyboard navigation, after any positive tabindex values and its order is defined by the document's source order.
The tabindex Attribute These elements will receive keyboard focus before elements with no tabindex value (or tabindex="0" ) resulting in a navigation order that is different from the visual and/or screen reader order.
The tabindex attribute specifies the tab order of an element (when the "tab" button is used for navigating). The tabindex attribute can be used on any HTML element (it will validate on any HTML element. However, it is not necessarily useful).
Control tab order is determined by the order in which controls are drawn on the screen. The first control that you draw is assigned a tab order of 1 , the next is given tab order number 2 , and so on.
tabindex assignments are handled the following way (for elements that support the tabindex attribute):
This information is taken from : http://www.w3.org/TR/html401/interact/forms.html#adef-tabindex
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