Function val_parser 

pub fn val_parser(input: &str) -> IResult<&str, Val>

Parser for strings that represent a bevy::ui::Val.

The syntax is inspired by CSS:

• auto -> Val::Auto
• 12px -> Val::Px(12.0)
• 12% -> Val::Percent(12.0)
• 12vw -> Val::Vw(12.0)
• 12vh -> Val::Vh(12.0)
• 12vmin -> Val::VMin(12.0)
• 12vmax -> Val::VMax(12.0)