<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Page title - 52css.com</title> </head> <body> <p style="color: red"> ... </p> </body> </html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Page title - 52css.com</title> <style type="text/css" media="screen"> p { color: red; } </style> </head> <body>... </body> </html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="content-type" content="text <title>Page title - 52css.com</title> <link rel="stylesheet" href="name.css" type="text/css" media="screen" /> < /head> <body> ... </body> </html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="content-type" content="text <title>Page title - 52css.com</title> <style type="text/css" media="screen"> @import url("styles.css"); </style> </head> <body> ... </body> </html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="content-type" content="text <title>Page title - 52css.com</title> <link rel="stylesheet" href="name.css" type="text/css" media="screen" /> </head> <body> ... </body> </html>
低效率的 p{ font-family: arial, helvetica, sans-serif; } #container { font-family: arial, helvetica, sans-serif; } #navigation { font-family: arial, helvetica, sans-serif; } #content { font-family: arial, helvetica, sans-serif; } #sidebar { font-family: arial, helvetica, sans-serif; } h1 { font-family: georgia, times, serif; } 高效的 body { font-family: arial, helvetica, sans-serif; } body { font-family: arial, helvetica, sans-serif; } h1 { font-family: georgia, times, serif; }
低效率的 h1 { color: #236799; } h2 { color: #236799; } h3 { color: #236799; } h4 { color: #236799; } 高效的h1, h2, h3, h4 { color: #236799; }
低效率的 p { margin: 0 0 1em; } p { background: #ddd; } p { color: #666; } 译者注: 对于十六进制颜色值,个人偏向于色值不缩写且英文字母要大写的方式. 高效的 p { margin: 0 0 1em; background: #ddd; color: #666; }
低效率的 body { font-size: 85%; font-family: arial, helvetica, sans-serif; background-image: url(image.gif); background-repeat: no-repeat; background-position: 0 100%; margin-top: 1em; margin-right: 1em; margin-bottom: 0; margin-left: 1em; padding-top: 10px; padding-right: 10px; padding-bottom: 10px; padding-left: 10px; border-style: solid; border-width: 1px; border-color: red; color: #222222; 高效的 body { font: 85% arial, helvetica, sans-serif; background: url(image.gif) no-repeat 0 100%; margin: 1em 1em 0; padding: 10px; border: 1px solid red; color: #222; }
慎用写法 #news { background: #ddd !important; } 特定情况下可以使用以下方式提高权重级别 #container #news { background: #ddd; } body #container #news { background: #ddd; }
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