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diff --git a/content/handlers/html/box_normalise.h b/content/handlers/html/box_normalise.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 normalise interface.
+ */
+
+#ifndef NETSURF_HTML_BOX_NORMALISE_H
+#define NETSURF_HTML_BOX_NORMALISE_H
+
+/**
+ * Ensure the box tree is correctly nested by adding and removing nodes.
+ *
+ * \param block  box of type BLOCK, INLINE_BLOCK, or TABLE_CELL
+ * \param root   root box of document
+ * \param c      content of boxes
+ * \return true on success, false on memory exhaustion
+ *
+ * The tree is modified to satisfy the following:
+ * \code
+ * parent               permitted child nodes
+ * BLOCK, INLINE_BLOCK  BLOCK, INLINE_CONTAINER, TABLE
+ * INLINE_CONTAINER     INLINE, INLINE_BLOCK, FLOAT_LEFT, FLOAT_RIGHT, BR, TEXT
+ * INLINE, TEXT         none
+ * TABLE                at least 1 TABLE_ROW_GROUP
+ * TABLE_ROW_GROUP      at least 1 TABLE_ROW
+ * TABLE_ROW            at least 1 TABLE_CELL
+ * TABLE_CELL           BLOCK, INLINE_CONTAINER, TABLE (same as BLOCK)
+ * FLOAT_(LEFT|RIGHT)   exactly 1 BLOCK or TABLE
+ * \endcode
+ */
+bool box_normalise_block(struct box *block, const struct box *root, struct html_content *c);
+
+#endif