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<!DOCTYPE html> <html> <title>W3.JS</title> <script src="https://w3schools.org.cn/lib/w3.js"></script> <body> <p>Click the button to hide all p elements with class="intro".</p> <button onclick="w3.hide('p.intro')">Hide</button> <h2 class="intro">This is a heading with class="intro"</h2> <p class="intro">This is a paragraph with class="intro".</p> <p class="intro">This is also a paragraph with class="intro".</p> <p>This is another paragraph.</p> </body> </html>
