标签
<!DOCTYPE html>
<html>
<body>
This is my first web page
</body>
</html>
<!DOCTYPE html>
The first line on the top, <!DOCTYPE html>, is a document type declaration and it lets the browser know which flavor of HTML you’re using (HTML5, in this case). It’s very important to stick this in - If you don’t, browsers will assume you don’t really know what you’re doing and act in a very peculiar way.
<html> <body>
To get back to the point, <html> is the opening tag that kicks things off and tells the browser that everything between that and the </html> closing tag is an HTML document. The stuff between <body> and </body> is the main content of the document that will appear in the browser window.
不是所有都要结束的，如换行符
Not all tags have closing tags like this (<html></html>) some tags, which do not wrap around content will close themselves. The line-break tag for example, looks like this :
- a line break doesn’t hold any content so the tag merrily sits by its lonely self. We will come across these examples later. All you need to remember is that all tags with content between them should be closed, in the format of opening tag → content → closing tag. It isn’t, strictly speaking, always a requirement, but it’s a convention we’re using in these tutorials because it’s good practice that results in cleaner, easier to understand code.
属性
Tags can also have attributes, which are extra bits of information. Attributes appear inside the opening tag and their values sit inside quotation marks. They look something like <tag attribute="value">Margarine</tag>. We will come across tags with attributes later.
在开始的时候插入
<tag attribute = 'value'>Margarine</tag>
Elements
As another example, whereas “<title>” and “</title>” are tags, “<title>Rumple Stiltskin</title>” is a title element.
标签内部，包括标签的，就叫做元素
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