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Viewing file:     insertBySelector.js (1005 B)      -rw-r--r--

"use strict";

var memo = {};
/* istanbul ignore next  */

function getTarget(target) {
  if (typeof memo[target] === "undefined") {
    var styleTarget = document.querySelector(target); // Special case to return head of iframe instead of iframe itself

    if (window.HTMLIFrameElement && styleTarget instanceof window.HTMLIFrameElement) {
      try {
        // This will throw an exception if access to iframe is blocked
        // due to cross-origin restrictions
        styleTarget = styleTarget.contentDocument.head;
      } catch (e) {
        // istanbul ignore next
        styleTarget = null;
      }
    }

    memo[target] = styleTarget;
  }

  return memo[target];
}
/* istanbul ignore next  */


function insertBySelector(insert, style) {
  var target = getTarget(insert);

  if (!target) {
    throw new Error("Couldn't find a style target. This probably means that the value for the 'insert' parameter is invalid.");
  }

  target.appendChild(style);
}

module.exports = insertBySelector;