diff --git a/_includes/js-selector.html b/_includes/js-selector.html
index c4e18ee..0420199 100644
--- a/_includes/js-selector.html
+++ b/_includes/js-selector.html
@@ -62,7 +62,7 @@
 
 {% capture script %}/assets/js/dist/{{ js }}.min.js{% endcapture %}
 
-<script src="{{ script | relative_url }}"></script>
+<script defer src="{{ script | relative_url }}"></script>
 
 {% if page.math %}
   <!-- MathJax -->
@@ -143,7 +143,7 @@
       }
     };
   </script>
-  <script src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=es6"></script>
+  <script async src="https://cdnjs.cloudflare.com/polyfill/v3/polyfill.min.js?features=es6"></script>
   <script id="MathJax-script" async src="{{ site.data.origin[type].mathjax.js | relative_url }}"></script>
 {% endif %}