源代码
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>编程字典</title> <style> h1.intro { color: blue; text-align: center; } .important { background-color: yellow; } </style> </head> <body> <h1 class="intro important">标题1</h1> <p>这是一个段落.</p> </body> </html>
运行结果