HTML5+CSS3响应式垂直时间轴，使用了HTML5标签<section>，时间轴中所有的内容包括标题、简介、时间和图像都放在.cd-timeline-block的DIV中，多个DIV形成一个序列，并把这些DIV放在<section>中。-HTML5+ CSS3 Responsive Vertical Timeline, use the HTML5 tag <section>, Timeline all content including title, descr iption, time and images are placed .cd-timeline-block in the DIV, DIV form a plurality of series and put them on the DIV <section> in.