Merge pull request #16 from TheAjinkya/patch-1

Update Collection-of-CSS-Questions.md

Author: rohan-paul

CSS/Collection-of-CSS-Questions.md

@@ -363,9 +363,9 @@ For example with this selector `p span`, browsers firstly find all the `<span>`
 
 ### Describe pseudo-elements and discuss what they are used for.
 
-A CSS pseudo-element is a keyword added to a selector that lets you style a specific part of the selected element(s). They can be used for decoration (`:first-line`, `:first-letter`) or adding elements to the markup (combined with `content: ...`) without having to modify the markup (`:before`, `:after`).
+A CSS pseudo-element is a keyword added to a selector that lets you style a specific part of the selected element(s). They can be used for decoration (`::first-line`, `::first-letter`) or adding elements to the markup (combined with `content: ...`) without having to modify the markup (`:before`, `:after`).
 
-- `:first-line` and `:first-letter` can be used to decorate text.
+- `::first-line` and `::first-letter` can be used to decorate text.
 - Used in the `.clearfix` hack as shown above to add a zero-space element with `clear: both`.
 - Triangular arrows in tooltips use `:before` and `:after`. Encourages separation of concerns because the triangle is considered part of styling and not really the DOM.