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diff --git a/content/handlers/html/box_construct.h b/content/handlers/html/box_construct.h
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+/*
+ * Copyright 2020 Vincent Sanders <vince@netsurf-browser.org>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file
+ * HTML Box tree construction interface.
+ */
+
+#ifndef NETSURF_HTML_BOX_CONSTRUCT_H
+#define NETSURF_HTML_BOX_CONSTRUCT_H
+
+/**
+ * Construct a box tree from a dom and html content
+ *
+ * \param n dom document
+ * \param c content of type CONTENT_HTML to construct box tree in
+ * \param cb callback to report conversion completion
+ * \param box_conversion_context pointer that recives the conversion context
+ * \return netsurf error code indicating status of call
+ */
+nserror dom_to_box(struct dom_node *n, struct html_content *c, box_construct_complete_cb cb, void **box_conversion_context);
+
+
+/**
+ * aborts any ongoing box construction
+ */
+nserror cancel_dom_to_box(void *box_conversion_context);
+
+
+/**
+ * Retrieve the box for a dom node, if there is one
+ *
+ * \param node The DOM node
+ * \return The box if there is one
+ */
+struct box *box_for_node(struct dom_node *node);
+
+/**
+ * Extract a URL from a relative link, handling junk like whitespace and
+ * attempting to read a real URL from "javascript:" links.
+ *
+ * \param content html content
+ * \param dsrel relative URL text taken from page
+ * \param base base for relative URLs
+ * \param result updated to target URL on heap, unchanged if extract failed
+ * \return true on success, false on memory exhaustion
+ */
+bool box_extract_link(const struct html_content *content, const struct dom_string *dsrel, struct nsurl *base, struct nsurl **result);
+
+#endif