[webkit-dev] Tab key Navigation

[n179911]

Hi,
Is 'Tab key Navigation a browser functionality or Webkit functionally?
For example, I load google.com, I put my mouse on the search input box click
once. The search input box should have focus.
And then i press 'Tab', the focus should moved.

But what I find out is the way Safari moves focus is different from Chromium
(both uses Webkit but may be using different versions). So I would like to
know if the Tab key navigation a Webkit functionality or a Browser
functionality?

Thank you.,
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