details和summary标签
用于文档说明，有自带收缩、展开功能
<!DOCTYPE HTML> <html> <body> <details> <summary>HTML 5</summary> This document teaches you everything you have to learn about HTML 5. </details> </body> </html>
用于文档说明，有自带收缩、展开功能
<!DOCTYPE HTML> <html> <body> <details> <summary>HTML 5</summary> This document teaches you everything you have to learn about HTML 5. </details> </body> </html>
