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diff --git a/content/handlers/html/interaction.h b/content/handlers/html/interaction.h
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+/*
+ * Copyright 2004 James Bursa <bursa@users.sourceforge.net>
+ *
+ * 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 content user interaction handling
+ */
+
+#ifndef NETSURF_HTML_INTERACTION_H
+#define NETSURF_HTML_INTERACTION_H
+
+/**
+ * Context for scrollbar
+ */
+struct html_scrollbar_data {
+	struct content *c;
+	struct box *box;
+};
+
+/**
+ * Handle mouse tracking (including drags) in an HTML content window.
+ *
+ * \param  c	  content of type html
+ * \param  bw	  browser window
+ * \param  mouse  state of mouse buttons and modifier keys
+ * \param  x	  coordinate of mouse
+ * \param  y	  coordinate of mouse
+ */
+nserror html_mouse_track(struct content *c, struct browser_window *bw,
+			browser_mouse_state mouse, int x, int y);
+
+
+/**
+ * Handle mouse clicks and movements in an HTML content window.
+ *
+ * This function handles both hovering and clicking. It is important that the
+ * code path is identical (except that hovering doesn't carry out the action),
+ * so that the status bar reflects exactly what will happen. Having separate
+ * code paths opens the possibility that an attacker will make the status bar
+ * show some harmless action where clicking will be harmful.
+ *
+ * \param c content of type html
+ * \param bw browser window
+ * \param mouse state of mouse buttons and modifier keys
+ * \param x x coordinate of mouse
+ * \param y y coordinate of mouse
+ * \return NSERROR_OK or appropriate error code.
+ */
+nserror html_mouse_action(struct content *c, struct browser_window *bw,
+			browser_mouse_state mouse, int x, int y);
+
+bool html_keypress(struct content *c, uint32_t key);
+
+void html_overflow_scroll_callback(void *client_data,
+		struct scrollbar_msg_data *scrollbar_data);
+
+void html_search(struct content *c, void *context,
+		search_flags_t flags, const char *string);
+
+void html_search_clear(struct content *c);
+
+#endif