Putting a spoiler on MathJax equations does not work well sometimes, as reported [here](https://puzzling.stackexchange.com/questions/14743/ages-of-a-and-b-self-reference-in-past) (1st answer).

For example,

> 
> $$a=1$$ $$b=2$$ $$c=3$$
> 
> 
> 

can be written using

```
> $$a=1$$
> $$b=2$$
> $$c=3$$

```

or

```
> $$a=1$$ $$b=2$$ $$c=3$$

```

**However**, writing

```
>! $$a=1$$ $$b=2$$ $$c=3$$

```

or

```
>! $$a=1$$
>! $$b=2$$
>! $$c=3$$

```

results in no line breaks in the preview pane. To see this in action, edit this post and look at this block:

> 
>  $$a=1$$
>  $$b=2$$
>  $$c=3$$
> 
> 
> 

**Where have the line breaks gone?**