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In Web development, "tag soup" refers to syntactically or structurally incorrect HTML written for a web page. Because web browsers have historically treated HTML syntax or structural errors leniently, there has been little pressure for web developers to follow published standards, and therefore there is a need for all browser implementations to be able to treat what looks like HTML as "tag soup", accepting and correcting for invalid syntax and structure. An HTML parser (part of a web browser) that is capable of interpreting HTML-like markup even if it contains invalid syntax or structure may be called a tag soup parser. All major web browsers currently have a tag soup parser for interpreting malformed HTML. "Tag soup" encompasses many common authoring mistakes, such as malformed HTML tags, improperly nested HTML elements, and unescaped character entities (especially ampersands (&) and less-than signs (<)). The Markup Validation Service is a resource for web page authors to avoid creating tag soup. ==Overview== "Tag soup" is a term used to denigrate various practices in web authoring. Some of these (roughly ordered from most severe to least severe) include: # Malformed markup where tags are improperly nested or incorrectly closed. For example, the following: This is a malformed fragment of HTML. # Invalid structure where elements are improperly nested according to the DTD for the document. Examples of this include nesting a "ul" element directly inside another "ul" element for any of the HTML 4.01 or XHTML DTDs. # Use of proprietary or undefined elements and attributes instead of those defined in W3C recommendations. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tag soup」の詳細全文を読む スポンサード リンク
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