这种新标记是一个画布，可以在其上绘制直线和矩形、放置图片、进行旋转等。
This new tag is a graphics canvas on which you can draw lines and rectangles, place images, perform rotations, and more.
只要一支手写笔，或者一只鼠标，用户就可以在画布上绘制图片，且这并不需要程序员来跟踪或处理任何事件。
Using a stylus, or alternately a mouse, users can draw on the canvas without the developer needing to directly deal with tracking events.
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