Valid CSS or Hack?

Question

Put this at the top of your CSS file:

* { margin: 0; padding: 0; }  

hack? or valid CSS? What does it do? and how is it transferred to different browsers / versions?

Answer 1

This is valid CSS. It selects an EVERY element and resets the default field values ​​and paddings. The reason people use this is to make their site layout more consistent across browsers / versions, as each browser has its own default stylesheet. If you do not use this declaration or specify margin / padding for each element, each browser will use its own default paddings / padding for this element, and the page will be displayed inconsistently in different browsers.

Answer 2

http://css-tricks.com/margin-0-padding-0-no-longer-cool/

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Answer 5

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Answer 7

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As tf111 explains, the idea is to get rid of certain browser options for margins and padding, which are different in all browsers.