javascript - Should I load responsive design via JS or CSS -

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i looking make responsive design. curious know how people feel on loading responsive design, should load in new css file , use js define screen size. or should create media queries inside current css file , go there. looking opinion on speed , people feel more optimal approach.

putting regarding styles in css files best practice.

  • html => structure
  • css => styles
  • js => logic

the more separate concerns, easier code mantain.


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