I believe it’s still wildly wrong. Had arp242 not spoken up at that time, I’d have been saying something similar, because the numbers were to me blindingly obviously extremely unrealistic. The entire HTML Standard (which is somewhat of a misnomer now, it covers much more than just HTML, quite a bit of CSS interactions, other web platform functionality, JavaScript APIs, and the likes) is now about half a million words by the most generous of counting methods (it’s written in a fairly verbose style, which is a really really really good thing when you compare it to the average IETF RFC), and I suspect it’s bigger than everything else put together, apart from ECMAScript (around 270,000 words¹ and probably growing at a faster rate than all other specs: it’s written in an even more verbose style, most of which is effectively straight code in prose form, whereas in the HTML Standard “straight code” is only a decent chunk of it).

As for WebGL, the WebGL parts are actually quite little. https://registry.khronos.org/webgl/specs/latest/1.0/ is only about 20,000 words. I gather it defers significantly to GLES20 (PDF, 204 pages, ~60,000 words), and GLES20GLSL (PDF, 119 pages, ~30,000 words), and it has GL32CORE in its references (PDF, 404 pages, ~125,000 words), but doesn’t actually use cite it in the text and I don’t know if it’s relevant. There doesn’t look to be anything else significant that wouldn’t already be included.

But really, WebGL is a fairly thin layer atop OpenGL ES 2.0, just removing some functionality and applying some restrictions. I believe you would reasonably expect a browser to use an existing OpenGL ES 2.0 implementation, so I’d be quite content to exclude the 90,000 (or perhaps it’s ~215,000?) words of that, just like it’s common to reuse an existing JavaScript engine (though you also don’t have to). Yet note this: it seems that even if we include it all (and presuming I haven’t missed anything, which I admit I could easily have done, I’m not conversant with these specs like I am with HTML/CSS/JS specs), it’s still under 0.2% of Drew’s massively-inflated figure.

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¹ Whew, https://262.ecma-international.org/ took me several minutes to download, despite being only 7MB. Sigh; the trials of being in Australia, where things hosted in the USA are often inexplicably painfully slow—like, sub-256kbps. When already downloaded, it renders in under four seconds, which is really fairly impressive when it’s doing all that layout on a document a million pixels tall—this ain’t a PDF where you can only render one page at a time. The HTML Standard is almost two million pixels tall, and also loads completely in under four seconds—simpler styles, perhaps? I refer to it often enough that I build it locally so I don’t have to download its 13MB all the time, or compromise with the multipage version that you can’t search through as easily.