# Check Web Element This action checks if a selector (CSS or XPath) can be found or not. A great example how to use it can be found here: [Send Notification](/using-zerowork/using-building-blocks/send-notification.md#example-check-if-cookies-expired-or-are-missing). ### Video Tutorial {% embed url="" %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.zerowork.io/using-zerowork/using-building-blocks/check-web-element.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.