Run ❯
Get your own website
❯Run Code Ctrl+Alt+R
Save Code Ctrl+Alt+A
Change Orientation Ctrl+Alt+O
Change Theme Ctrl+Alt+D
Go to Spaces Ctrl+Alt+P
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> </head> <body> <h1>Cascading Dropdown Example</h1> Subjects: <select name="subject" id="subject"> <option value="" selected="selected">Select subject</option> </select> <br><br> Topics: <select name="topic" id="topic"> <option value="" selected="selected">Please select subject first</option> </select> <br><br> Chapters: <select name="chapter" id="chapter"> <option value="" selected="selected">Please select topic first</option> </select> <br><br> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>