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Douglas Crockford And if that weren t enough, it s now being embedded in a lot of applications. Most of the Adobe applications have JavaScript in them so you can script them locally. And other applications as well. So it s become hugely popular. The problem with the language is that it was rushed to market way too fast and standardized way too fast. So most of its defects are not in the current implementations they are in the specification. The standard says do this incorrectly. Which is appalling. But that s the state of it. It got frozen in 1999 and then should have gone into neglect and died. But instead, by accident, Ajax happened and suddenly it s the world s most important programming language. So now we re thinking that we need to fix it. But the time to have fixed it should have been in 2000. But it didn t get fixed then, back when everyone was paying no attention to it. Now it s huge. There s another thing that s odd about JavaScript in the web context: If you re doing a server application or a desktop application or an embedded application, you get to choose not only the language but which specific compiler you re going to use, which specific runtime you re going to use. You don t get that choice in JavaScript. You have to run on everything that s out there. Because we have to run on everything, bugs don t get fixed. If a browser maker ships a bug and goes, Oops, we screwed up, and the next month they ship another one, we cannot depend on all of their users doing the upgrade. The mainstream, once they get IE installed on their machine, that s it; they don t upgrade. Those bugs stay there for years. Seibel: So that s the current situation. Yet you want the Web to be a better platform for developing applications. If we can t fix the problems we have unless all the browsers fix it and even that doesn t help, we re just stuck. What s the way forward Crockford: That s the thing I struggle with. I can see the ideal. I know what it needs to be. And I know where we are and I can see all the obstructions in the way. And so I m trying to figure out how do we take this forward. We re in a trap, in a sense, in that we have developed these huge systems I m more concerned with the economic systems and the social systems, but
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Douglas Crockford also the technological systems that are dependent on this system which was not thought through very well. The worst feature of JavaScript, without question, is its dependence on a global object. It doesn t have linkers, it doesn t have any kind of information hiding between compilation units. It all gets dumped together into a common global object. So all the components see everything else; all the components have equal access to the DOM; they all have equal access to the network. If any script gets onto your page it can go to the server and represent itself as your script and there s absolutely no way the server can tell the difference. It has access to the screen; it can go to the user and represent itself as your script and the user can t tell the difference. All of the new antiphishing things that they re putting in the chrome don t work if the page came from your server and all scripts come with the same authority no matter where they came from. But it s even worse than that because there are other ways that script can get onto your page. The architecture of the Web has several languages in it there s HTTP, there s HTML, URLs are a language, there s CSS, and there s the scripting language. They re all in there and they can all be embedded in each other and they all have different quoting and escaping and commenting conventions. And they are not consistently implemented in all of the browsers. Some of them are not specified anywhere. So it s really easy for an evildoer to take some script and put it in a URL, put it in a piece of style and put that in some HTML and put that in another script, and so on. Seibel: Those are the classic cross-site scripting attacks, taking advantage of bugs in the browser. Crockford: Right. That s horrible; we have to fix that it s intolerable that we keep going this way. On top of that we ve discovered mash-ups. And mash-ups realize something that we ve been trying to do in software for 20 years: to have interesting reusable components that we can snap together like LEGO and make new applications out of, instantly. And we re doing that stuff in mash-ups and it s
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