Honest question, since I have no clue about web/browser engines other than being able to maybe name 4-5 of them (Ladybird, Servo, Webkit, Gecko, … shit, what was Chromium’s called again?):
What makes browsers/browser engines so difficult that they need millions upon millions of LOC?
Naively thinking, it’s “just” XML + CSS + JS, right? (Edit: and then the networking stack/hyperlinks)
So what am I missing? (Since I’m obviously either forgetting something and/or underestimating how difficult engines for the aforementioned three are to build…)
JavaScript alone is not a simple beast. It needs to be optimized to deal with modern JavaScript web apps so it needs JIT, it also needs sandboxing, and all of the standard web APIs it has to implement. All of this also needs to be robust. Browsers ingest the majority of what people see on the Internet and they have to handle every single edge case gracefully. Robust software is actually incredibly difficult and good error handling often adds a lot more code complexity. Security in a browser is also not easy, you’re parsing a bunch of different untrusted HTML, CSS, and JavaScript. You’re also executing untrusted code.
Then there is the monster that is CSS and layout. I can’t imagine being the people that have to write code dealing with that it’d drive me crazy.
Then there are all of the image formats, HTML5 canvases, videos, PDFs, etc. These all have to be parsed safely and displayed correctly as well.
There is also the entire HTTP spec that I didn’t even think to bring up. Yikes is that a monster too, you have to support all versions. Then there is all of that networking state and TLS + PKI.
There is likely so much that I’m still leaving out, like how all of this will also be cross platform and sometimes even cross architecture.
Thanks for these explanations, that makes a lot more sense now. I didn’t even think to consider browsers might be using something else than an off-the-shelf implementation for image/other file formats…, lol
Sorry I didn’t mean to imply they don’t use shared libs, they definitely do, but they have to integrate them into the larger system still and put consistent interfaces over them.
Honest question, since I have no clue about web/browser engines other than being able to maybe name 4-5 of them (Ladybird, Servo, Webkit, Gecko, … shit, what was Chromium’s called again?):
What makes browsers/browser engines so difficult that they need millions upon millions of LOC?
Naively thinking, it’s “just” XML + CSS + JS, right? (Edit: and then the networking stack/hyperlinks)
So what am I missing? (Since I’m obviously either forgetting something and/or underestimating how difficult engines for the aforementioned three are to build…)
JavaScript alone is not a simple beast. It needs to be optimized to deal with modern JavaScript web apps so it needs JIT, it also needs sandboxing, and all of the standard web APIs it has to implement. All of this also needs to be robust. Browsers ingest the majority of what people see on the Internet and they have to handle every single edge case gracefully. Robust software is actually incredibly difficult and good error handling often adds a lot more code complexity. Security in a browser is also not easy, you’re parsing a bunch of different untrusted HTML, CSS, and JavaScript. You’re also executing untrusted code.
Then there is the monster that is CSS and layout. I can’t imagine being the people that have to write code dealing with that it’d drive me crazy.
Then there are all of the image formats, HTML5 canvases, videos, PDFs, etc. These all have to be parsed safely and displayed correctly as well.
There is also the entire HTTP spec that I didn’t even think to bring up. Yikes is that a monster too, you have to support all versions. Then there is all of that networking state and TLS + PKI.
There is likely so much that I’m still leaving out, like how all of this will also be cross platform and sometimes even cross architecture.
Thanks for these explanations, that makes a lot more sense now. I didn’t even think to consider browsers might be using something else than an off-the-shelf implementation for image/other file formats…, lol
Sorry I didn’t mean to imply they don’t use shared libs, they definitely do, but they have to integrate them into the larger system still and put consistent interfaces over them.