<--...--> tag is used to insert comments in HTML code. [Support all browsers]
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<comment> tag is also used to insert comments in HTML code but only in Internet Explorer
browser. [We don't recommend it] always use <--...--> tag instead
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Everytext written between these tags won't be readable by the browser.
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Also <--...//--> tag is use to hide scripts,Once tagged, browser won't read
script, here two forward slashes // prevent JavaScript to execute --> tag