• standards mode
• html: aqua background, 10px red border, 20px padding, border-box sizing, height:100%
• body: yellow background with grid image, 10px green border, 30px padding, border-box sizing, height:100%

This same page:

• without height:100% on html and body
• without border-box sizing
• without height:100% on body
• without height:100% on body, and without border-box sizing

CSS tests home