Group related form fields with a legend using Designsystemet styles.
Examples
ds_fieldset("Preferences",
ds_checkbox("opt1", "Option 1"),
ds_checkbox("opt2", "Option 2")
)
#> <fieldset class="ds-fieldset">
#> <legend>Preferences</legend>
#> <input id="opt1" name="opt1" class="ds-input ds-shiny-input" type="checkbox"/>
#> <label for="opt1">Option 1</label>
#> <input id="opt2" name="opt2" class="ds-input ds-shiny-input" type="checkbox"/>
#> <label for="opt2">Option 2</label>
#> </fieldset>