解析：两个子元素 div 实现半透明的圆形，设置绝对定位重叠在一起，然后设置相同的动画通过不同的延迟时间交替放大缩小。 解析：在类名为 元素下有五个 div 实现的长方形元素，设置Y轴的缩放，通过不同的延迟时间来达到依次变化的效果。 解析：两个子 ...

A security researcher has discovered a vulnerability in the WebKit rendering engine used by Safari that crashes and restarts the iOS operating system used by iPhones and iPads. The vulnerability can ...

One of the more important details of understanding and using Cascading Style Sheets (CSS) is the cascading aspect of its name. That is, how are multiple rules for the same element handled? This week, ...