类选择器 Plutonium Useful for many applicatons, plutonium can also be danger Safety Information When handlin plutonium, care must be taken to avoid the form implosion is very real, and must be avoid at all cost. This can separate Comments It's best to avoid using plutonium at al/ if it can be avoided
类选择器 p.warning.urgent {font-style: italic; color: blue} p.urgent.warning {font-style: italic; color: blue}
ID选择器 <html> <head> <title> Plutonium/title> <style type="text/css"><- </styl </head> <body> <h1 id="lead-head">Plutonium</h1> p>Useful for many. </p> <h2> Safety Information</h2> span>When handling plutonium.</span> <span>With plutonium </span> <h3>Comments</h3> <p>It's best to avoid ...</p> </body> </html>
ID选择器 <html> <head> <title>Plutonium</title> <style type="text/css"><!-- … --></style> </head> <body> <h1 id="lead-head">Plutonium</h1> <p>Useful for many...</p> <h2>Safety Information</h2> <p> <span>When handling plutonium...</span> <span>With plutonium... </span> </P> <h3>Comments</h3> <p>It's best to avoid ...</p> </body> </html>
ID选择器 #lead-head color: red; background: yellow,]
ID选择器 #lead-head {color: red; background: yellow;}
ID选择器 Plutonium Useful for many applicatons plutonium can also be dangerous if Safety Information When handlin plutonium care must be taken to avoid the formati implosion is very real, and must be avoid at all cost This can be separate Comments It's best to avoid using plutonium at all if it can be avoided
ID选择器 #lead-head {color: red; background: yellow;}
属性选择器 <html> <head> <title> Plutonium/title> <style type="text/css"><- </styl </head> <body> <h1 lang="en"title="urgent warning">Plutonium</h1> <p>Useful for many.</p <h2> Safety Information</h2> span>When handling plutonium.</span> <span>With plutonium </span> <h3>Comments</h3> <p>It's best to avoid ...</p> </body> </html>
属性选择器 <html> <head> <title>Plutonium</title> <style type="text/css"><!-- … --></style> </head> <body> <h1 lang="en" title="urgent warning">Plutonium</h1> <p>Useful for many...</p> <h2>Safety Information</h2> <p> <span>When handling plutonium...</span> <span>With plutonium... </span> </P> <h3>Comments</h3> <p>It's best to avoid ...</p> </body> </html>