public function getAttributes()
    {
        if (self::$attributes === null) {
            self::$attributes = $this->loadJson($this->resource('HtmlBooleanAttributes.json'))->attributes;
        }

        return self::$attributes;
    }
public function getAttributes()
    {
        if (self::$attributes === null) {
            self::$attributes = $this->loadJson($this->resource('HtmlBooleanAttributes.json'))->attributes;
        }

        return self::$attributes;
    }
public function getAttributes ( ) { if ( self :: $ attributes === null ) { self :: $ attributes = $ this -> loadJson ( $ this -> resource ( 'HtmlBooleanAttributes.json' ) ) -> attributes ; } return self :: $ attributes ; }
Get the html boolean attributes.

@throws \ArjanSchouten\HtmlMinifier\Exception\FileNotFoundException

@return \Illuminate\Support\Collection
Get the html boolean attributes .