Specifies the HTML element(s) to use for the 'previous' button.
By default, the next button contains an SVG arrow pointing to the left:
<svg viewBox="0 0 24 24">
<path fill="currentColor" d="M15.41,16.58L10.83,12L15.41,7.41L14,6L8,12L14,18L15.41,16.58Z"></path>
</svg>
This can be any valid HTML element or text.
The below carousel has been given an
prevHTML value of
"Previous".