保持透明(透明度混合)屏幕覆盖范围最小。
Keep Transparent (alpha blend) screen coverage to a minimum.
做网站的时候，我每天都用它来为颜色选用找感觉，包括它看起来会如何、如果覆盖整个屏幕效果会怎样、做幻灯片用哪个颜色好等等。
I use this daily when building websites to get a feel for what a color will look like when it covers the whole screen, which makes it perfect for presentation slides as well.
移动设备上的W3C CSSOM：这些测试覆盖了屏幕大小、鼠标位置、文档大小和滚动位置等。
Mobile W3C CSSOM - Covers aspects like screen size, mouse position, document size, and scroll offset.
应用推荐