After some trial-and-error, this is what I found. Adding (to the original CSS): html { height: 100% }. delivered exactly what I was looking ... ... <看更多>

Specifies the size of the background images. ... otherwise a percentage; Animatable: Yes; CSS Object Model Property: backgroundSize; Percentages: see text ... ... <看更多>

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css -background-size.css. html {. background: url(images/bg.jpg) no-repeat center center fixed;. -webkit-background-size: cover; ... css-only-technique-1.css ... ... <看更多>