Web确实需要矢量格式以与比例无关的方式有效地传达复杂图形。
The Web really needs a vector format for efficiently conveying complex graphics in a scale-independent way.
尽管简单的线条绘图很方便，但是它们的表达能力不够强，不足以表示字体这样的复杂图形。
Though simple line drawings can be convenient, they are simply not expressive enough for something as complicated as fonts.
canvas最初是由apple为其safari浏览器开发的，作为复杂图形设施如SVG支持的基础。
Canvas was first developed by Apple for their Safari browser as a foundation for complex graphics facilities such as SVG support.
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