Edit: As pointed out by @hsivonen, in HTML5 the a element has no title attribute. However, the above principles even now use to other named elements. 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 And so the characters [ and ] usually are not valid in both ids or names in HTML4 (they might https://elliottveflv.blogsidea.com/44423047/harvard-case-study-help-no-further-a-mystery