In the text, whom refers to: 
It can be inferred from the text that. 
Television fills the gap, in the text, means that TV: 
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HTML format is a kind of search engine.
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HTML provides solutions for dealing with barriers faced by blind and deaf people.
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Providing access to contents through keyboard input makes websites much more friendly for older people as well.
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Information conveyed by images may not reach the intended public if there is no alternative text.
On the ideas of the text and the vocabulary used in it, judge the next items.
File formats for Excel, other than that introduced in Excel 2007, generated larger files.