题目内容：
根据下列题干，回答题：A Web browser is simply a terminal emulator, designed to display text on a screen. The two es- sential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with （ 1 ）, and that it has a （ 2 ）for displaying graphical files, display text, display graph- ics, and （ 3 ）hyperlinks -- there' s 99 percent of the（ 4 ）value. That' s not to say that the manufactur- ers didn' t go all - out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Re- member when media channels in the browser were a big deal, instead of the clutter you can' t wait to de- lete from your favorites of bookmarks menu? Remember when client - side Java applets were supposed to become the preferred（ 5 ） for application development? Remember frames and all their nasty side effects?
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