It has since been discovered that MSIE 3.0x doesn't follow the character rules outlined in thosespecs. As a result, the parsing rules used are a bit less strict. しかし、MSIE 3.0xがこれらのRFCで定義された文字の規則に従っていないことが判明したため、結局、やや厳密さを欠く構文解析規則にせざるを得ませんでした。 - Python
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