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<!DOCTYPE html> <html> <head> <title>HTML Case sensitivity Example</title> <style> #a{color:red;} #A{color:blue;} </style> </head> <Body> <h2>HTML Case sensitivity Example.</H2> <h1 id="a">Hello w3context</h1> <h1 id="A">Hello w3context</h1> </BODY> </html>