"When a user clicks on a button, all \<p> elements will be hidden:" - here the "\<p>" is taken as html tag due to which text is moving to next line. The intention of author is to say that all paragraph (\<p>) tags will be hidden. The "\<p>" itself is not showing as it's considered an HTML tag. I have added an escape character in front.
		
			
				
	
	
	
		
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title
| title | 
|---|
| jQuery | 
jQuery
jQuery is the most widely-used JavaScript library, and is used in more than half of all major websites.
jQuery makes web development easier to use by providing a number of 'helper' functions. These help developers to quickly write DOM (Document Object Model) interactions without needing to manually write as much JavaScript themselves.
jQuery adds a global variable with all of the libraries methods attached. The naming convention is to have this global variable as </code>. by typing in <code>.
Example
When a user clicks on a button, all <p> elements will be hidden:
$(document).ready(function(){
    $("button").click(function(){
        $("p").hide();
    });
});
