本文主要讨论了现代图形语言中三种常见的设计元素，它们分别为：影像元素、绘画元素、文字元素。
This text mainly discussed three kinds of common contemporary design elements in graphic language which are image element, artistic element, character element.
我在以前的文章中曾经提到，影像树对于呈现定制元素的巨大好处是它保留了一个健康的、井井有条的文档树。
As I said in my previous article, one huge advantage of shadow trees for the rendering of custom elements is that they leave a healthy and un-cluttered document tree.
如前所述，在这里可以放置需要复制到每个定制元素实例影像树中的任何SVG。
As I said earlier, this is where you place all the SVG that is copied into the shadow tree of each custom element instance.
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