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I have been looking at the CSS files for many websites like Facebook and Youtube.
In almost all of them I see this code:
* { margin: 0; padding: 0; } It is odd, as removing that block in chrome web developer tools doesn't affect the layout of the page.
What does this code mean, and when is it used and why?
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The asterisk (*) is known as the CSS universal selectors. It can be used to select any and all types of elements in an HTML page. The asterisk can also be followed by a selector while using to select a child object. This selector is useful when we want to select all the elements on the page.
This is a common technique called a CSS reset. Different browsers use different default margins, causing sites to look different by margins. The * means "all elements" (a universal selector), so we are setting all elements to have zero margins, and zero padding, thus making them look the same in all browsers.
In CSS, a class is a group of elements that are the same or similar. You can have as many elements as you want in a class. And each element can be the member of multiple classes. Every class has CSS attributes (like color and font-size) that are specific to that class. CSS classes are similar to a real-life class.
This is a common technique called a CSS reset. Different browsers use different default margins, causing sites to look different by margins. The * means "all elements" (a universal selector), so we are setting all elements to have zero margins, and zero padding, thus making them look the same in all browsers.
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