Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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JavaScript

function дорогойЯваскриптСделайПожалуйстаТакЧтобыЭтаШтукаСработалаПослеWindowLoad(f) {
  window.addEventListener('load', f)
}


дорогойЯваскриптСделайПожалуйстаТакЧтобыЭтаШтукаСработалаПослеWindowLoad(
  function(){
     alert('магия, йопта!')
  }
)

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