UseHTML-gitbook.Rmd

## How to use this online book {-}

In the desktop-computer version of this book,
icons appear at the top of each page.
On other devices, 
all or some of these icons may also appear.

* **Navigation**: Navigate between pages using the arrows. 

* The **table of contents** can be toggled on or off using the Contents menu item:
  
```{r echo=FALSE}
knitr::include_graphics("Menu-TOC.png")
```

* Words can be searched for using **Search** button on the menu:
  
```{r echo=FALSE}
knitr::include_graphics("Menu-Search.png")
```

* The font can be changed (e.g., enlarged) using the **Font** button on the menu:
  
```{r echo=FALSE}
knitr::include_graphics("Menu-Font.png")
```


* A **PDF** version of the book can be downloaded using the PDF button on the menu:
  
```{r echo=FALSE}
knitr::include_graphics("Menu-PDF.png")
```

::: {.importantBox .important data-latex="{important}"}
The book is optimised for *online viewing*,
and the book may be updated frequently,
so a printed PDF version may not be the most recent version.
:::


In some places, 
interactive 'quiz' questions are given.
*In the online version*,
the background turns from red to green when the answer is correct.
Try it now:

::: {.webex-check .webex-box}
1. What is $1+1$?
`r if( knitr::is_html_output() ) {mcq( c("One", answer="Two", "Three") )}`
1. What is $1+2$?
`r if( knitr::is_html_output() ) {fitb( answer= c("3", "three"), ignore_case=TRUE )}`
1. Is $2 + 2=4$?
`r if( knitr::is_html_output() ) { torf( TRUE )}`
1. Which one of these is FALSE?
`r if( knitr::is_html_output() ) { 
   longmcq( c("The inventor of the fairy floss machine was a dentist",
              "Barack Obama has won two Grammy awards",
              answer = "Once a year all of Wikipedia is printed, and placed in a vault in Norway.") )}`
:::