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docs-web-html-dom-element-api

Document

The elementFromPoint() method—available on both the Document and ShadowRoot objects—returns the topmost Element at the specified coordinates (relative to the viewport).
Elements with pointer-events set to none will be ignored, and the element below it will be returned.
If the element at the specified point belongs to another document (for example, the document of an <iframe> ), that document's parent element is returned (the <iframe> itself).
If the element at the given point is anonymous or XBL generated content, such as a textbox's scroll bars, then the first non-anonymous ancestor element (for example, the textbox) is returned.
If you need to find the specific position inside the element, use Document.caretPositionFromPoint() .

Node.parentNode
- returns the parent of the specified node in the DOM tree.
- parentNode is the parent of the current node.
- The parent of an element is an Element node, a Document node, or a DocumentFragment node.

This read-only property is zero for elements with no CSS or inline layout boxes;
- otherwise, it's the inner height of an element in pixels
- It includes padding but excludes borders, margins, and horizontal scrollbars (if present).
clientHeight can be calculated as: CSS height + CSS padding - height of horizontal scrollbar (if present).
- This property will round the value to an integer.
- If you need a fractional value, use element.getBoundingClientRect() .
When clientHeight is used on the root element (the <html> element), (or on <body> if the document is in quirks mode), the viewport's height (excluding any scrollbar) is returned.
- This is a special case of clientHeight.