diff --git a/exampleSite/layouts/partials/foot_custom.html b/exampleSite/layouts/partials/foot_custom.html
index 3389d46..4f9aaa2 100644
--- a/exampleSite/layouts/partials/foot_custom.html
+++ b/exampleSite/layouts/partials/foot_custom.html
@@ -1,4 +1,4 @@
-<script src="//yihui.org/js/math-code.js"></script>
-<script async src="//mathjax.rstudio.com/latest/MathJax.js?config=TeX-MML-AM_CHTML"></script>
+<script defer src="//yihui.org/js/math-code.js"></script>
+<script defer src="//mathjax.rstudio.com/latest/MathJax.js?config=TeX-MML-AM_CHTML"></script>
 
-<script async src="//yihui.org/js/center-img.js"></script>
+<script defer src="//yihui.org/js/center-img.js"></script>