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+# Adding a new IDL file
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+
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+Serenity's build system does a lot of work of turning the IDL from a Web spec into code, but there are a few things you'll need to do yourself.
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+
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+For the sake of example, let's say you're wanting to add the `HTMLDetailsElement`.
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+
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+1. Create `LibWeb/HTML/HTMLDetailsElement.idl` with the contents of the IDL section of the spec. In this case, that would be:
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+```webidl
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+[Exposed=Window]
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+interface HTMLDetailsElement : HTMLElement {
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+ [HTMLConstructor] constructor();
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+
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+ [CEReactions] attribute boolean open;
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+};
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+```
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+
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+2. If the IDL starts with `[Exposed=Window]`, remove that line from the .idl file, and add the following to [`LibWeb/Bindings/WindowObjectHelper.h`](../../Userland/Libraries/LibWeb/Bindings/WindowObjectHelper.h):
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+ - `#include <LibWeb/Bindings/HTMLDetailsElementConstructor.h>` and
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+ - `#include <LibWeb/Bindings/HTMLDetailsElementPrototype.h>` to the includes list.
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+ - `ADD_WINDOW_OBJECT_INTERFACE(HTMLDetailsElement) \` to the macro at the bottom.
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+
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+3. Add a `libweb_js_wrapper()` call to [`LibWeb/CMakeLists.txt`](../../Userland/Libraries/LibWeb/CMakeLists.txt)
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+
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+4. Forward declare the generated classes in [`LibWeb/Forward.h`](../../Userland/Libraries/LibWeb/Forward.h):
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+ - `HTMLDetailsElement` in its namespace.
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+ - `HTMLDetailsElementWrapper` in the `Web::Bindings` namespace.
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+
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+5. If your interface is an Event type:
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+ - Add `#import <DOM/Event.idl>` at the top of the IDL file.
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+ - Open [`LibWeb/Bindings/EventWrapperFactory.cpp`](../../Userland/Libraries/LibWeb/Bindings/EventWrapperFactory.cpp) and add an `#include` directive and `if` statement for your new Event type.
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+
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