MIME 型は明示しなければならない ご存知の通り、スクリプト言語を html 文書で使う場合、必ず MIME 型を指定する必要があります。 type = content-type [CI] This attribute specifies the scripting language of the element's contents and overrides the default scripting language. The scripting language is specified as a content type (e.g., "text/javascript"). Authors must supply a value for this attribute. There is no default value for this attribute. しかし、スクリプト