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<!DOCTYPE html> <html> <head> <style> #parent { height: 100px; width: 250px; border: 2px solid blue; } #child { height: 50%; width: 75%; border: 2px solid red; } </style> </head> <body> <h1>The height Property</h1> <div id="parent"> <div id="child">I'm half the height of my parent.</div> </div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>