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.