HTML DOM alt Property http://www.w3school.com.cn/htmldom/prop_img_alt.asp HTML DOM height Property http://www.w3school.com.cn/htmldom/prop_img_height.asp HTML a tag http://www.w3school.com.cn/tags/tag_a.asp HTML br tag http://www.w3school.com.cn/tags/tag_br.asp CSS background Property http://www.w3school.com.cn/css/pr_background.asp CSS border Property http://www.w3school.com.cn/css/pr_border.asp JavaScript Date() Method http://www.w3school.com.cn/jsref/jsref_date.asp JavaScript anchor() Method http://www.w3school.com.cn/jsref/jsref_anchor.asp