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const queryString = () => 
  Array.from(
    ((new URL(location))
      .searchParams)
        .entries())
  .reduce(
    (obj, [key, value]) => Object.assign(obj, { [key]: value })
    , {});

document.documentMode && document.documentMode < 11 && alert("Browser below IE11 is unsupported.");
document.documentMode || console.log("No more IE.");