emphasis preset

Focus a single line

```{.r code-line-style="focus:3" code-line-style-preset="emphasis"}
df |>
  ...
```

df |>
  filter(cyl == 6) |>
  group_by(gear) |>
  summarise(m = mean(mpg)) |>
  arrange(desc(m))

Dim everything except the focus

```{.r code-line-style="dim:1-2,focus:3,dim:4-5"
        code-line-style-preset="emphasis"}
```

df |>
  filter(cyl == 6) |>
  group_by(gear) |>
  summarise(m = mean(mpg)) |>
  arrange(desc(m))

Strong call-out

df |>
  filter(cyl == 6) |>
  group_by(gear) |>
  summarise(m = mean(mpg)) |>
  arrange(desc(m))

YAML form with preset selection

```{r}
#| code-line-style:
#|   preset: emphasis
#|   steps:
#|     - { dim: 1-2 }
#|     - { focus: 3, dim: [1-2, 4-5] }
#|     - { strong: 3, dim: [1-2, 4-5] }
```

mtcars |>
  dplyr::filter(cyl == 6) |>
  dplyr::group_by(gear) |>
  dplyr::summarise(m = mean(mpg)) |>
  dplyr::arrange(dplyr::desc(m))