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WJCorrection status：qualified
Teacher's comments：内容过于简单，建议标题改为中文。
Collection
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The entire context of HTML is included in the <html></html> (Also known as the root element).
Inside the root element, there are two elements:
<head></head><body></body>Therefore a typical HTML document should look like:
<html> <head> <!-- Head parts here --> </head> <body> <!-- Body parts here --> </body> </html>
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id=''class=''style=''
We can select and obtain one particular element using id=''.
We can select and obtain a kind of elements using class=''.
We can change the style of an element using style=''.
Different selectors have different priority levels. Usually style='' > id='' > class=''