I saw an unusual thing in This Website: 
[AccuWeather.com](http://www.accuweather.com/en/ca/toronto/m5g/weather-forecast/55488)  

Some tags in this page (like `li`s) have a `href` with a url in its `Class` attribute, Like the picture below,  

So what I want to know is: 

1- Why they used the `href` and `url` in class attribute? 

2- how can I do this? 

[ScreenShot http://4ax.ir/images/screenaja.jpg](http://4ax.ir/images/screenaja.jpg "Look at the highlighter space").