No. When Web devs test in multiple browsers and find that something doesn't work in one of them, they will usually pick an alternative solution that does work in all of them, avoiding the bug in the buggy browser, thus avoiding a situation where their site depends on that bug continuing to exist. It doesn't always work out as well as that, but it often does.
You can wish for something better than the Web platform, but it's a tall order. You want a platform that's not controlled by a single vendor, that has multiple open-source non-patent-encumbered implementations with significant market share, that is available across just about every device, that has a vibrant content/application ecosystem and developer community, that supports everything from simple static content to extremely complex applications like office suites and 3D games. Good luck with that.