34 lines
1003 B
JavaScript
34 lines
1003 B
JavaScript
"use strict";
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var memo = {};
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/* istanbul ignore next */
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function getTarget(target) {
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if (typeof memo[target] === "undefined") {
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var styleTarget = document.querySelector(target);
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// Special case to return head of iframe instead of iframe itself
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if (window.HTMLIFrameElement && styleTarget instanceof window.HTMLIFrameElement) {
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try {
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// This will throw an exception if access to iframe is blocked
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// due to cross-origin restrictions
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styleTarget = styleTarget.contentDocument.head;
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} catch (e) {
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// istanbul ignore next
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styleTarget = null;
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}
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}
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memo[target] = styleTarget;
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}
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return memo[target];
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}
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/* istanbul ignore next */
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function insertBySelector(insert, style) {
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var target = getTarget(insert);
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if (!target) {
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throw new Error("Couldn't find a style target. This probably means that the value for the 'insert' parameter is invalid.");
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}
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target.appendChild(style);
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}
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module.exports = insertBySelector; |