jQuery DOM
1. text() : Sets or returns the text content of the selected element
2. html() : Sets or returns the content of the selected element (including html tags)
3. val() : Set or return the value of the form field
4. attr() : Get the attribute value
jQuery add element
1. append() : insert content at the end of the selected element (still inside the element)
2. prepend() : Insert content at the beginning of the selected element
3. after() : Insert content after the selected element
4. before() : Insert content before the selected element
jQuery remove element
1. remove() : removes the selected element and its children
2. empty() : remove child elements from the selected element (delete the child elements of the selected element)
jQuery get and set CSS class
1. addClass() : Add one or more classes to the selected element
2. removeClass() : removes one or more classes from the selected element
3. toggleClass() : The toggle operation of adding/removing the selected element
4. css() : Set or return style properties
jQuery size
1. width() : the width of the element (excluding padding/border/margin)
2. height() : the height of the element
3. innerWidth() : Returns the width of the element (including padding)
4. innerHeight() : returns the height of the element
5. outerWidth() : Returns the width of the element (including padding+border)
6. outerHeight() : returns the height of the element