Avoiding losing tree builder output
Speculative tree building fails when document.write() changes the tree builder state such that the speculative state after the </script> tag no longer holds when all the content inserted by document.write() has been parsed. However, only unusual uses of document.write() cause trouble. Here are
幾個需要避免的問題:
- 不要使用造成不平均樹的寫法，例如：<script>document.write("<div>");</script> 要寫成 <script>document.write("<div></div>");</script>
- 記得不要少寫了結束符號,例如：<script>document.write("<div></div");</script>
- 不要在寫入的字串中使用 \r ，例如<script>document.write("Hello World!\r");</script>，應該使用 \n 代替<script>document.write("Hello World!\n");</script>
- Note that writing balanced tags may cause other tags to be inferred in a way that makes the write unbalanced. E.g. <script>document.write("<div></div>");</script> inside the head element will be interpreted as <script>document.write("</head><body><div></div>");</script> which is unbalanced.
- Don't let the semicolon of a named character reference be the last thing that is written. Due to a bug in Firefox 4 though 10 (fixed in Firefox 11), <script>document.write("foo ");</script> causes a speculation failure. However, <script>document.write(" foo");</script> is OK.
- TODO: document.write inside formatting elements.
- 本文為轉載文章 [原文]
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2012-01-12T10:06:00+0000