Add initial content for setHTMLUnsafe and parseHTMLUnsafe

files/en-us/web/api/document/parsehtmlunsafe_static/index.md

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+---
+title: "Document: parseHTMLUnsafe() static method"
+short-title: parseHTMLUnsafe()
+slug: Web/API/Document/parseHTMLUnsafe_static
+page-type: web-api-static-method
+browser-compat: api.Document.parseHTMLUnsafe_static
+---
+
+{{APIRef("DOM")}}{{SeeCompatTable}}{{SecureContext_Header}}
+
+The **`Document.parseHTMLUnsafe()`** static method is used to parse a string of HTML as a new document object.
+
+## Syntax
+
+```js-nolint
+const doc = Document.parseHTMLUnsafe(input)
+```
+
+### Parameters
+
+- `input`
+  - : A string defining HTML to be parsed.
+
+### Return value
+
+A {{domxref("Document")}}.
+
+### Exceptions
+
+None.
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- Parsing HTML or XML into a DOM tree: {{domxref("DOMParser")}}
+- {{domxref("Element.setHTMLUnsafe")}}

files/en-us/web/api/element/sethtmlunsafe/index.md

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+---
+title: "Element: setHTMLUnsafe() method"
+short-title: setHTMLUnsafe()
+slug: Web/API/Element/setHTMLUnsafe
+page-type: web-api-instance-method
+browser-compat: api.Element.setHTMLUnsafe
+---
+
+{{APIRef("DOM")}}{{SeeCompatTable}}{{SecureContext_Header}}
+
+The **`setHTMLUnsafe()`** method of the {{domxref("Element")}} interface is used to parse a string of HTML and then insert it into the DOM as a subtree of the element.
+
+## Syntax
+
+```js-nolint
+element.setHTMLUnsafe(input)
+```
+
+### Parameters
+
+- `input`
+  - : A string defining HTML to be parsed.
+
+### Return value
+
+None (`undefined`).
+
+### Exceptions
+
+None.
+
+## Examples
+
+The code below demonstrates how to parse a string of HTML and insert it into the `Element` with an id of `target`.
+
+```js
+const value = "<p>This is a string of text</p>"; // string of HTML
+
+// Get the Element with id "target" and set it with the string.
+document.getElementById("target").setHTMLUnsafe(value);
+
+// Result (as a string): "<p>This is a string of text</p>"
+```
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- {{domxref("Element.innerHTML")}}
+- {{domxref("Document.parseHTMLUnsafe_static")}}

files/en-us/web/api/shadowroot/sethtmlunsafe/index.md

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+---
+title: "ShadowRoot: setHTMLUnsafe() method"
+short-title: setHTMLUnsafe()
+slug: Web/API/ShadowRoot/setHTMLUnsafe
+page-type: web-api-instance-method
+browser-compat: api.ShadowRoot.setHTMLUnsafe
+---
+
+{{APIRef("DOM")}}{{SeeCompatTable}}{{SecureContext_Header}}
+
+The **`setHTMLUnsafe()`** method of the {{domxref("ShadowRoot")}} interface is used to parse a string of HTML and then insert it into the DOM as a subtree of the shadow root.
+
+## Syntax
+
+```js-nolint
+shadowRoot.setHTMLUnsafe(input)
+```
+
+### Parameters
+
+- `input`
+  - : A string defining HTML to be parsed.
+
+### Return value
+
+None (`undefined`).
+
+### Exceptions
+
+None.
+
+## Specifications
+
+{{Specifications}}
+
+## Browser compatibility
+
+{{Compat}}
+
+## See also
+
+- {{domxref("ShadowRoot.innerHTML")}}
+- {{domxref("Document.parseHTMLUnsafe_static")}}