HTML5 part of the thing

HTML5 Knowledge Summary
1 Form Action:
1.1 FormAction-Override the form's Action property
Instance:


1.2 The placeholder in the input field, which indicates the prompt information entered in the default text field, the information of this hint disappears once the data is fetched in the text field.
1.3 The new type attribute of the input field:
Email,
Url
Number: With attribute Min,max, and the secondary Action property of step
Range
Date
Month
Week
Time
Datetime:
Datetime-local:
Search
Color
The new autofocus= ' autofocus ' in 1.4 input, which realizes the function of automatically acquiring focus
Define keywords for search engines:

Define a description of the page:

Define the latest version of the page:

Refresh the page every 5 seconds:

HTML5 part of the thing