摘要：
(19)A selection of tips招数19：精选技巧集合Including height and width in tags will allow your page to render more quickly, because space can be allocated for the image before it is downloaded.在标签中包括height和width属性会加速你的页面呈现，因为下载完成之前空间可以分配给图像。(20)Add script references at the bottom of the page, because asynchr. 阅读全文
