An alternative would be HTML5 + Web Socket. Dynamsoft (the company I work for) is looking at providing such a solution for the customers using our NPAPI TWAIN Plugin.
Meanwhile, TWAIN Working Group is working on SWORD for driverless scanning.
Question
Now, when Chrome states NPAPI deprecated what are the alternatives for TWAIN scanning? It seems that NaCl does not have TWAIN support.
Solution
An alternative would be HTML5 + Web Socket. Dynamsoft (the company I work for) is looking at providing such a solution for the customers using our NPAPI TWAIN Plugin.
Meanwhile, TWAIN Working Group is working on SWORD for driverless scanning.