public function setStyle(array $css_properties=[]) :self {
		// init the style attribute is it didn't exist already
		isset($this->attributes['style']) ?: $this->attributes['style'] = '';
		// for each of the css properties
		foreach($css_properties as $css_property => $css_value) {
			// add them to the already existing ones
			$this->attributes['style'] .= $css_property.':'.$css_value.';';
		}
		// return self
		return($this);
	}