phrases - Relating multiple names and values

I don't know why I have problem with saying a label:value consturction in English:

What should I write:

• In R2, the attributes tagName and className are used to identify the main article of the web page.


• In R2, the tagName and className attributes are used to identify the main article of the web page


• In R2, the attributes of tagName and className are used to identify the main article of the web page