The Complete Set

css rule

stylesheet.insertRule(rule, index)
https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet.insertRule
CSSStyleSheet.deleteRule()
document.styleSheets[0].insertRule('#elid:hover { background-color: red; }', 0);
document.styleSheets[0].cssRules[0].style.backgroundColor= 'red';
===
document.styleSheets[0].addRule('#elid:hover', 'background-color: red', 0);
document.styleSheets[0].rules[0].style.backgroundColor= 'red';

css_p.css

:first-child        :first-of-type        :only-child
:last-child         :last-of-type         :only-of-type                  
:nth-child          :nth-of-type    
:nth-last-child     :nth-last-of-type

::first-letter      ::first-line          ::first-word
::last-letter       ::last-line           ::last-word
::nth-letter        ::nth-line            ::nth-word
::nth-last-letter   ::nth-last-line       ::nth-last-word 

jquery selecter

window.Sizzle = jQuery.find;