1. Concept: write a css styles can fit multiple terminals simultaneously, in order to solve the mobile Internet is born.
2. Role: the face of strong different resolution devices the flexibility to adapt quickly to solve the problem of multiple devices display
3. Principle
Media Inquiries
① Outreach Media Query Syntax
When the screen form greater than or equal 960px, documents incorporated red.css
When the screen window is smaller than 960px, documents incorporated blue.css
② embedded media queries
grammar:
When the screen form greater than and less than 640px 960px, body red background
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