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.
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File formats for Excel, other than that introduced in Excel 2007, generated larger files.
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In line 9, “unless” can be correctly replaced by except if.
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Preceding formats pose access complications for Excel 2010.
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Replacing “earlier” (l.17) by older changes the meaning of the last sentence of the text.
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An important feature of Excel 2010 is its awareness of the presence of elements from different formats in the same file.