R Language Crawler: A comparison of CSS methods and XPath methods (table Introduction)

• CSS selector vs. XPath usage

Target	Matching Nodes	CSS 3	XPath
All nodes	~	*	//*
Find a level, level two, level three header node	,,	h1,h2,h3	//h1,//h2,//h3
All P-Nodes	<p>	p	//p
All child nodes of the P node	<p>All nodes under the label	p > *	//p/*
Find all Li tags that contain attr attributes	<li attr="~">	li[attr]	li[@attr]
Find all Li tags with attr values of value	<li attr="value">	li[attr=value]	//li[@attr=‘value‘]
Find all div nodes with an ID value of item	<div id="item">	div#item	//div[@id=‘item‘]
Find all tags that contain foo in the class value	<* class="foo blahblah">	.foo	//*[contains(@class,‘foo‘)]
First P-node	<p>the first of many<p>	p:first-child	//p[1]
Nth node of P	The nth of <p> the numerous<p>	p:nth-child	//p[n]
All p nodes that have child node A	<p><a></p>	CSS cannot be implemented	//p[a]
Find text content is the p node of "Web scraping"	<p>Web Scraping</p>	CSS cannot be implemented	//p[text()="Web Scraping"]

R Language Crawler: A comparison of CSS methods and XPath methods (table Introduction)