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IT Notes → CSS @ December 22, 2020

  • display: none takes the element completely out of play, whereas visibility: hidden keeps the element and its flow in place without visually representing its contents (a gap is kept for the element, say in case of a div).
  • block elements put a line break before and after the element.
  • Pseudo classes:   selector: pseudo class {property: value;} E.g.: link, visited, active, hover.
  • Pseudo element: (IE does not support) selector:pseudo element {property: value;} E.g.: first-letter, first-line, before, after.
  • If the selectors are the same then the latest one will always take precedence.
  • The more specific a selector, the more preference it will be given when it comes to conflicting styles.
  • You give every id selector (“#whatever”) a value of 100, every class selector (“.whatever”) a value of 10 and every HTML selector (“whatever”) a value of 1.
  • @ At-rules are instructions or directives to the CSS parser. We have given some examples below.

The @charset at-rule can be used to specify the character encoding of an external style sheet. It must appear before anything else in the file.

The @import at-rule allows us to import one style sheet into another. All @import at-rules must appear before any rules.

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