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htmlDOM树

原文： https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_shadow_DOM

Shadow DOM API 研究一下：

html 的DOM树结构如下图，

每两个node之间会有一个text, node里面也有text和子node.

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This article assumes you are already familiar with the concept of the DOM (Document Object Model) — a tree-like structure of connected nodes that represents the different elements and strings of text appearing in a markup document (usually an HTML document in the case of web documents). As an example, consider the following HTML fragment:

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Simple DOM example</title>
  </head>
  <body>
      <section>
        <img src="dinosaur.png" alt="A red Tyrannosaurus Rex: A two legged dinosaur standing upright like a human, with small arms, and a large head with lots of sharp teeth.">
        <p>Here we will add a link to the <a href="https://www.mozilla.org/">Mozilla homepage</a></p>
      </section>
  </body>
</html>