HTML5のDOCTYPE宣言
<DOCTYPE html> <html lang="ja"> <head> <mata charset="UTF-8"> <title>HTML5のDOCTYPE宣言</title> </head> <body> </body> </html>
<DOCTYPE html> <html lang="ja"> <head> <mata charset="UTF-8"> <title>HTML5のDOCTYPE宣言</title> </head> <body> </body> </html>