diff --git a/src/core/operations/CSSSelector.mjs b/src/core/operations/CSSSelector.mjs
deleted file mode 100644
index d6b8da11..00000000
--- a/src/core/operations/CSSSelector.mjs
+++ /dev/null
@@ -1,91 +0,0 @@
-/**
- * @author n1474335 [n1474335@gmail.com]
- * @copyright Crown Copyright 2016
- * @license Apache-2.0
- */
-
-import Operation from "../Operation.mjs";
-import OperationError from "../errors/OperationError.mjs";
-import xmldom from "xmldom";
-import nwmatcher from "nwmatcher";
-
-/**
- * CSS selector operation
- */
-class CSSSelector extends Operation {
-
-    /**
-     * CSSSelector constructor
-     */
-    constructor() {
-        super();
-
-        this.name = "CSS selector";
-        this.module = "Code";
-        this.description = "Extract information from an HTML document with a CSS selector";
-        this.infoURL = "https://wikipedia.org/wiki/Cascading_Style_Sheets#Selector";
-        this.inputType = "string";
-        this.outputType = "string";
-        this.args = [
-            {
-                "name": "CSS selector",
-                "type": "string",
-                "value": ""
-            },
-            {
-                "name": "Delimiter",
-                "type": "binaryShortString",
-                "value": "\\n"
-            }
-        ];
-    }
-
-    /**
-     * @param {string} input
-     * @param {Object[]} args
-     * @returns {string}
-     */
-    run(input, args) {
-        const [query, delimiter] = args,
-            parser = new xmldom.DOMParser();
-        let dom,
-            result;
-
-        if (!query.length || !input.length) {
-            return "";
-        }
-
-        try {
-            dom = parser.parseFromString(input);
-        } catch (err) {
-            throw new OperationError("Invalid input HTML.");
-        }
-
-        try {
-            const matcher = nwmatcher({document: dom});
-            result = matcher.select(query, dom);
-        } catch (err) {
-            throw new OperationError("Invalid CSS Selector. Details:\n" + err.message);
-        }
-
-        const nodeToString = function(node) {
-            return node.toString();
-            /* xmldom does not return the outerHTML value.
-            switch (node.nodeType) {
-                case node.ELEMENT_NODE: return node.outerHTML;
-                case node.ATTRIBUTE_NODE: return node.value;
-                case node.TEXT_NODE: return node.wholeText;
-                case node.COMMENT_NODE: return node.data;
-                case node.DOCUMENT_NODE: return node.outerHTML;
-                default: throw new Error("Unknown Node Type: " + node.nodeType);
-            }*/
-        };
-
-        return result
-            .map(nodeToString)
-            .join(delimiter);
-    }
-
-}
-
-export default CSSSelector;