Element.dataset is not supported on old browsers

1 files changed, 2 insertions, 2 deletions

diff --git a/src/main/assets/embed.js b/src/main/assets/embed.js
index d4cbab8e..3b8946bf 100644
--- a/src/main/assets/embed.js
+++ b/src/main/assets/embed.js
@@ -72,8 +72,8 @@ function makeIframe(src, w, h, scrolling='no') {
 }
 
 function makeResizableToRatio(element, ratio) {
-  element.dataset['ratio'] = ratio;
-  makeResizable(element, w => w * element.dataset['ratio']);
+  element.setAttribute('data-ratio', ratio);
+  makeResizable(element, w => w * element.getAttribute('data-ratio'));
 }
 
 // calcHeight :: Number -> Number -- calculate element height for a given width