// <html> هو <body> أب 
alert( document.body.parentNode === document.documentElement ); // صحيح

// <body> يأتي<head> بعد
alert( document.head.nextSibling ); // HTMLBodyElement

// <head> يكون <body> قبل
alert( document.body.previousSibling ); // HTMLHeadElement
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