font-feature-settings: value;
object.style.fontFeatureSettings = "value";
<'font-feature-settings'> = normal | <feature-tag-value>#
normal
No change in glyph selection or positioning occurs.
<feature-tag-value> = <string> [ <integer> | off | on ]?
<string>
Specifies a sequence of characters delimited by double quotes (") or single quotes (').
<integer>
Specifies one or more decimal digits (0-9).