id = window.requestAnimationFrame(rotate);
This is similar to the earlier code, but this time we place the rotation code inside a
function called rotate . The last line of this function uses the win-
dow.requestAnimationFrame() method and takes the rotate() function as an
argument. This will then call the rotate() function recursively. The frame rate cannot
be set using requestAnimationFrame() ; it's usually 60 frames per second, although
it's optimized for the device being used.
To start the animation, we need to call the window.requestAnimationFrame()
method, giving the rotate() function as an argument. This will return a unique ID
Refresh the animation.htm page and you should notice that the animation is much faster
and smoother, as shown in Figure 9.1 .
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