---
title: "Untitled"
author: "Hao"
date: "10/15/2017"
output: 
  html_document:
    theme: simplex
---

<script>
$(document).ready(function(){
    $('[tooltip-toggle="tooltip"]').tooltip(); 
});
</script>


```{r}
library(kableExtra)
```

`r cell_spec("hover over me", tooltip = spec_tooltip("Hello world", position = "right"))`