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<!DOCTYPE html> <html lang="en"> <head> <title>HTML id Attribute</title> <style> #firstName{ border: 1px solid red; } #container{ background: #ccc; } #infoText{ color: blue; } </style> </head> <body> <p><input type="text" id="firstName"></p> <div id="container">Some content</div> <p id="infoText">This is a paragraph.</p> </body> </html>
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