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codepen & js demos

Mutation Observer & customize resize event listener & demo

https://codepen.io/webgeeker/pen/YjrZgg

https://codepen.io/dashboard?type=search&opts_itemType=pen&opts_searchTerm=js&opts_order=newest&opts_depth=everything&opts_showForks=false&displayType=list&previewType=iframe&page=0

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Mutation Observer

https://javascript.ruanyifeng.com/dom/mutationobserver.html

https://developer.mozilla.org/zh-CN/docs/Web/API/MutationObserver

// todo

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resize & response width

https://developer.mozilla.org/en-US/docs/Web/API/Window/resize_event

const heightOutput = document.querySelector('#height');
const widthOutput = document.querySelector('#width');

function reportWindowSize() {
  heightOutput.textContent = window.innerHeight;
  widthOutput.textContent = window.innerWidth;
}

window.onresize = reportWindowSize;

// OR

window.addEventListener('resize', reportWindowSize);

https://codepen.io/xgqfrms/pen/dyyWrWb?&editable=true

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