diff --git a/js/h5p.js b/js/h5p.js
index a7096e7..05cd853 100644
--- a/js/h5p.js
+++ b/js/h5p.js
@@ -377,13 +377,29 @@ H5P.init = function (target) {
// Insert H5Ps that should be in iframes.
H5P.jQuery('iframe.h5p-iframe:not(.h5p-initialized)', target).each(function () {
- var contentId = H5P.jQuery(this).addClass('h5p-initialized').data('content-id');
+ const iframe = this;
+ const $iframe = $(iframe);
+
+ const contentId = $iframe.data('content-id');
const contentData = H5PIntegration.contents['cid-' + contentId];
- const language = contentData && contentData.metadata && contentData.metadata.defaultLanguage
+ const contentLanguage = contentData && contentData.metadata && contentData.metadata.defaultLanguage
? contentData.metadata.defaultLanguage : 'en';
- this.contentDocument.open();
- this.contentDocument.write('' + H5P.getHeadTags(contentId) + '');
- this.contentDocument.close();
+
+ const writeDocument = function () {
+ iframe.contentDocument.open();
+ iframe.contentDocument.write('' + H5P.getHeadTags(contentId) + '');
+ iframe.contentDocument.close();
+ };
+
+ $iframe.addClass('h5p-initialized')
+ if (iframe.contentDocument === null) {
+ // In some Edge cases the iframe isn't always loaded when the page is ready.
+ $iframe.on('load', writeDocument);
+ $iframe.attr('src', 'about:blank');
+ }
+ else {
+ writeDocument();
+ }
});
};