I see that when I press the tab key, links on the page aren’t getting focused.
I expect the TAB key to mark the next html control (anchors, inputs), like in any other site:

Is it a html/css issue?
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Pretty sure the default browser outline is being supressed, here is the code from the all.css file:
I have used this in some mobile websites, Android doesn’t play nice sometimes with its element outlines.
EDIT:
Here is how I override the outline, straight from HTML5 Boilerplate: