Rather than put that information into the HypertextMarkupLanguage (HTML) of the page in any old way, add some standardized HTML tags and Cascading Style Sheet (CSS) class names.
These crawlers look for missing content, validate all links, and ensure that your HypertextMarkupLanguage (HTML) is valid.
这些爬虫会查找缺少的内容、验证所有的链接，并会确保超文本标记语言（HTML）是有效的。
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Servers no longer dish up simple hypertextmarkuplanguage (HTML), the web's early lingua franca. Increasingly, web pages are bona fide pieces of software that are executed in the browser.