That's not how it works, I'm afraid. Sounds so simple, though, doesn't it? For one, if they disallowed the webOS user agent, you wouldn't even see the site in the first place.
Originally Posted by pattyland
It's the larger companies like Hulu, Netflix, and their ilk that restrict or "only allow" based on User Agents due to licensing and platform agreements along with miscellaneous but crucially important technological reasons.
Chances are (and I'm talking >99% here), the site simply uses aspects of HTML5 and CSS3 that the Touchpad simply cannot or was not designed to handle in its browser. I'll explain.
The Touchpad browser isn't nearly as current as it needs to be to keep up with the evolution of the web today, and part of that can be blamed on their use of older versions of Webkit all along the way with each and every release; the latest version is now almost two years old if you want to match up the version numbers to the release date. There are bi--no, huge--gaps in webOS 3.0.5 and prior that simply cannot support the kind of advanced sites individuals and companies are coming out with in 2012 and soon 2013.
And even since the last version of the webOS browser, the HTML5 specification itself has changed. In some ways, a lot.
Open webOS stands to correct this by updating the browser "core" to a modern specification and aligning the app experience with the browser experience, instead of letting certain aspects of Webkit only work within apps (like non-Flash A/V media, specifically), but blocking those same aspects from the browser. Not that this will help you, since Open webOS isn't coming to the Touchpad anytime soon, if ever.
When HP stopped updating Flash, leaving it at 10.3, people started noticing that major sites no longer worked as those sites upgraded their minimum allowable versions to 11.x due to technological and security concerns. Now, as HTML5 and CSS3 are being adopted as a much greater whole of the specification than it was in the days of webOS' as a commercial product, you're going to see the exact same problems happen on your favorite non-Flash sites in growing numbers.
Bottom Line: The web is evolving. Your Touchpad's browser isn't. Get used to it or get with a platform that's meeting those demands; there's no shortage of them, either.
That's just progress. On the web, it just happens to occur faster than almost anywhere else. If you want evidence, look here and you'll see clearly that webOS 3.0.x has suboptimal HTML5 support for a platform that was supposedly built to be the best on that same technology: http://html5test.com/results/tablet.html and specifically http://html5test.com/compare/browser/webos30.html