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# Adding a new IDL file
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.
For the sake of example, let's say you're wanting to add the `HTMLDetailsElement`.
1. Create `LibWeb/HTML/HTMLDetailsElement.idl` with the contents of the IDL section of the spec. In this case, that would be:
```webidl
[Exposed=Window]
interface HTMLDetailsElement : HTMLElement {
[HTMLConstructor] constructor();
[CEReactions] attribute boolean open;
};
```
2. If the IDL refers to other IDL types, you need to import those. For example, `CSSRule` has an attribute that returns a `CSSStyleSheet`, so that needs to be imported:
```webidl
#import <CSS/CSSStyleSheet.idl>
interface CSSRule {
readonly attribute CSSStyleSheet? parentStyleSheet;
};
```
3. Add a `libweb_js_bindings(HTML/HTMLDetailsElement)` call to [`LibWeb/idl_files.cmake`](../../Userland/Libraries/LibWeb/idl_files.cmake)
4. Forward declare the generated class in [`LibWeb/Forward.h`](../../Userland/Libraries/LibWeb/Forward.h):
- `HTMLDetailsElement` in its namespace.
5. If your type isn't an Event or Element, you will need to add it to [`is_platform_object()`](../../Meta/Lagom/Tools/CodeGenerators/LibWeb/BindingsGenerator/IDLGenerators.cpp)
so that it can be accepted as an IDL parameter, attribute or return type.
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