How to have same plot appearance in the RStudio Rmarkdown inline visualization and the knitted html?

When making plots in a Rmarkdown document with inline visualization, I can use fig.width and fig. heigth to adjust the plot size so that all proportions look good, including fonts. But then when I knit the html file, the plot will come out with different proportions, often with very enlarged fonts. So to make the plot looks as desired, I have to experiment and knit repeatedly, which is quite troublesome. I wonder if there is any chunk option I can set so that the knitted html figure will look the same as the inline. I have tried fig.width/height, out.width/heigth, dpi, fig.retina, without success.

Looking for a solution, I found an old StackOverflow question about this, without answer, suggesting that this may only happen in retina displays (r - Inline plot size and knitted plot size don't agree in RStudio on retina display - Stack Overflow).

A quick reproducible example is:

```{r, fig.height=2, fig.width=3}

ggplot(mtcars, aes(x = mpg, y = hp, color = cyl)) + 
  geom_point() + 
  ggtitle("I want the relative size of my font and plot just like this")

I am using RStudio 1.4 in a Retina Macbook.

I appreciate the help!

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