Answers for "w3schools css selectors"

child css

p:nth-child(2)
 	{     
 		background: red;
 	}

selector css

*all elements
divall div tags
div,pall divs and paragraphs
div pparagraphs inside divs
div > pall p tags, one level deep in div
div + pp tags immediately after div
div ~ pp tags preceded by div
.classnameall elements with class
#idnameelement with ID
div.classnamedivs with certain classname
div#idnamediv with certain ID
#idname *all elements inside #idname

CSS how to select ID

#id-selector-name{
  font-size: 20px;
}

.class-selector-name{
  color: green;
}

what is css selector

div { color: red; } // the "div" in .css is a selector targeting all <div> elements
simpleSelector = document.querySelectorAll()("div"); // all divs 
complexSelector = document.querySelector("div.user-panel.main input[name='login']")  // the first <input> element with the name "login" (<input name="login"/>) located inside a <div> whose class is "user-panel main" (<div class="user-panel main">) in the document is returned

css selector

css selector