Add more condition for wheather the element is focusable or not #147
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The conditions that are added are than the previous implementation:
1) Whether the element is expressly inert or not.
-> See the detail on isExpresslyInert(element)
2) Whether the element is being rendered or not.
-> See the detail on isBeingRendered(element)
: the condition
* check1. If an element has the style as "visibility: hidden | collapse" or "display: none", it is not being rendered.
* check2. If an element has the style as "opacity: 0", it is not being rendered.(that is, invisible).
* check3. If width and height of an element are explicitly set to 0, it is not being rendered.
* check4. If a parent element is hidden, an element itself is not being rendered. (CSS visibility property and display property are inherited.)
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The conditions that are added are than the previous implementation:
: Condition
Related to : w3c/csswg-drafts#3395