基础概念

html代码:https://baike.baidu.com/item/html%E4%BB%A3%E7%A0%81/1604640?fr=aladdin

js代码:https://baike.baidu.com/item/js%E4%BB%A3%E7%A0%81

CSS (层叠样式表):https://baike.baidu.com/item/CSS/5457

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