摘要：
The last challenge introduced the animation-timing-function property and a few keywords that change the speed of an animation over its duration. CSS o 阅读全文
摘要：
In CSS animations, the animation-timing-function property controls how quickly an animated element changes over the duration of the animation. If the 阅读全文
摘要：
In the previous challenge, you changed the animation rates for two similarly animated elements by altering their @keyframes rules. You can achieve the 阅读全文
摘要：
There are a variety of ways to alter the animation rates of similarly animated elements. So far, this has been achieved by applying an animation-itera 阅读全文
摘要：
Here's one more continuous animation example with the animation-iteration-count property that uses the heart you designed in a previous challenge. The 阅读全文