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天蓬老师批改状态：合格
老师批语：将样式理解为变量, 变量值只会有二种情况: 默认和自定义, css也是一样的
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>css元素样式来源-当前元素的属性</title></head><body><h1 style="color: darkgreen">我要学会PHP语言，开发小程序</h1></body></html>
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>css元素样式来源-当前文档</title><style>h1 {color: darkgreen;}</style></head><body><h1>我要学会PHP语言，开发小程序</h1></body></html>
<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>css元素样式来源-引入外部样式</title><link rel="stylesheet" href="test3.css" /></head><body><h1>我要学会PHP语言，开发小程序</h1></body></html>
test3.css的代码如下：
h1 {color: darkgreen;}
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