HTML5中对id属性的定义与规定
此次课程主讲内容是ID元素
id是一个元素的唯一标识，需确保每个元素的id的独一性。
id至少由一个字符组成，且不能包含空字符。
具有不为空id属性的元素，可以在css或DOM的getElementById() 方法中方便调用。
不排除一个元素有多个id的可能。
id属性值必须反映该元素的内容。
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