There is already such a standard:
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;PKCS_11" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;PKCS_11</a><p>And you can already setup firefox or chrome to work with smartcards.