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实战：带透明度的背景颜色
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<!DOCTYPE html> <html> <head> <style> div { background-color: green; } div.first { opacity: 0.1; } div.second { opacity: 0.3; } div.third { opacity: 0.6; } </style> </head> <body> <h1>Transparent Boxes</h1> <p>When using the opacity property to add transparency to the background of an element, all of its child elements become transparent as well. This can make the text inside a fully transparent element hard to read:</p> <div class="first"> <h1>opacity 0.1</h1> </div> <div class="second"> <h1>opacity 0.3</h1> </div> <div class="third"> <h1>opacity 0.6</h1> </div> <div> <h1>opacity 1 (default)</h1> </div> </body> </html>
