Add new line spaces between elements of an htmltools::tagList in an Rmarkdown html page

Question

I using htmltools::tagList to display a list of plots in an Rmarkdown html page.

Let's say my list of plots is:

set.seed(1)
plot.list <- lapply(1:3,
                    function(i) plotly::plot_ly(x=paste0(c("a", "b", "c"), ":", i), 
                                                y=paste0(c("d", "e", "f"), ":", i), 
                                                z=matrix(rnorm(9), 3, 3), 
                                                type="heatmap"))

And then I'm displaying them in an Rmarkdown using this code:

```{r display.plot, warning=FALSE, message=FALSE, echo=FALSE}
htmltools::tagList(plot.list)
```

The problem is that they come out with no new line spacing between them. So my question is how do I add new line spacing between them?