No-browser WebDriver for HTML-only testing (OSOE-895)

[Piedone]

Following up from #79.

If a test (or a feature to be tested) doesn't require JavaScript and CSS to be applied, just pure HTML is enough, then it would be more runtime/RAM-efficient to run it without a full browser. Rather, we could use something like HtmlAgilityPack or AngleSharp. Providing an IWebDriver implementation using these would offer a lightweight alternative to run a full browser.

It's a question though, what the actual tangible benefits would be, and how frequently we could utilize this.

See from this comment on details and ideas: #79 (comment)

Jira issue