=> app-header : <app-header>...</app-header>
=> div : <div> without </div>
=> div[3] : the third place of the below examples :
<div></div> : 1
<div></div> : 2
<div></div> : 3
<div></div> : 4
=> div : <div></div> => Thus this div can't be ignored
=> div[1] : the first place of the below examples :
<div></div> : 1
<div></div> : 2
XPATH : /html/body/app-root/nav/app-header/div/div/div[3]/div/div[1]
outerHTML5 format