html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CSS1</title>
</head>
<body>
<div id='div1'>
<div id='div2' >
<P>这是段落1</p>
<P>这是段落2</p>
<form >
<button>登录1</button><br><br>
账号<input type="text" name="username" id="ls_username" class="pn vm"><br><br>
密码<input type="text" name="password" id="ls_password" class="pn vm"><br><br>
</form>
<p>这是段落3</p>
<a href="">baidu</a>
</div>
<div id='div3'>
<p>这是段落4</p>
<button type="button" id="loginbutton">登录</button>
</div>
</div>
</body>
</html>
选取器 表达式
elements = driver.find_elements(By.CSS_SELECTOR, "#div2>:nth-child(3) input")
选取器 #div2>:nth-child(3) input
标签：段落,elements,伪类,选取,SELECTOR,CSS From： https://www.cnblogs.com/haha1988/p/17733088.html