def _inflexible_breadth(token):
    """Parse ``inflexible-breadth``."""
    keyword = get_keyword(token)
    if keyword in ('auto', 'min-content', 'max-content'):
        return keyword
    elif keyword:
        return
    length = get_length(token, negative=False, percentage=True)
    if length:
        return length
Parse ``inflexible-breadth``.
weasyprint/css/validation/properties.py