WebGL is an open web standard for rendering graphics on any compatible browser, without the need for additional plug-ins. WebGL is integrated completely into all the web standards of the browser allowing GPU accelerated usage of image processing and effects as part of the web page canvas. WebGL elements can be embedded with other HTML elements and composited with other parts of the page.
Although, most modern-day browsers support WebGL, visit this link to know more details about the exact versions that are supported.
Some browsers do not have WebGL enabled by default. To enable WebGL on your browser, see this article.