How to zoom in on plots inside an Rmarkdown presentation
<p>I am creating my first HTML - presentation with rmarkdown (ioslides) and would like to be able to manually zoom into a slide and navigate to an object.<br>
Zooming works fine in a browser (crtl +, crtl mouse wheel) but I can not move the slide. Neither with the mouse nor with scrollbars. The latter do not appear as they do e.g. on a website.<br>
Is there an appropriate way to implement such a thing or are ioslides not meant to be used like this? </p>

<p>I am using Ubuntu 16.04 (LXDE) and rstudio (R version 3.2.3). I tried zooming and navigating in Firefox and Chromium. </p>

<p>example:</p>

<pre><code>---
title: Zooming into an ioslide
author: "Robatt"
output: 
 ioslides_presentation: 
 fig_caption: yes
---

```{r setup, include=FALSE}
 knitr::opts_chunk$set(echo = FALSE)
```
##The slide to zoom in and navigate

```{r fig.align='left', out.width = "100px", dpi=300, 
fig.cap="a small graph to zoom in, when necessary"}
library(ggplot2)
x=c(1:30,by=0.1)
y=x/(1+x)
ggplot()+
  geom_smooth(aes(x=x,y=y),se=F,span=0.15,color="grey20")+
  labs(x="you can only read me after zooming in")
```
</code></pre>

<p><em>This also is the first time that I did not find an answer on stackoverflow and consequentially my first entry.</em></p>