diff --git a/content/handlers/html/html.c b/content/handlers/html/html.c
index 62f625f6b..30af90f97 100644
--- a/content/handlers/html/html.c
+++ b/content/handlers/html/html.c
@@ -645,6 +645,56 @@ void html_finish_conversion(html_content *htmlc)
 	dom_node_unref(html);
 }
 
+/* handler for a SCRIPT which has been added to a tree */
+static void
+dom_SCRIPT_showed_up(html_content *htmlc, dom_html_script_element *script)
+{
+	dom_exception exc;
+	dom_html_script_element_flags flags;
+	dom_hubbub_error res;
+	bool within;
+
+	if (!htmlc->enable_scripting) {
+		NSLOG(netsurf, INFO, "Encountered a script, but scripting is off, ignoring");
+		return;
+	}
+
+	NSLOG(netsurf, DEEPDEBUG, "Encountered a script, node %p showed up", script);
+
+	exc = dom_html_script_element_get_flags(script, &flags);
+	if (exc != DOM_NO_ERR) {
+		NSLOG(netsurf, DEEPDEBUG, "Unable to retrieve flags, giving up");
+		return;
+	}
+
+	if (flags & DOM_HTML_SCRIPT_ELEMENT_FLAG_PARSER_INSERTED) {
+		NSLOG(netsurf, DEBUG, "Script was parser inserted, skipping");
+		return;
+	}
+
+	exc = dom_node_contains(htmlc->document, script, &within);
+	if (exc != DOM_NO_ERR) {
+		NSLOG(netsurf, DEBUG, "Unable to determine if script was within document, ignoring");
+		return;
+	}
+
+	if (!within) {
+		NSLOG(netsurf, DEBUG, "Script was not within the document, ignoring for now");
+		return;
+	}
+
+	res = html_process_script(htmlc, (dom_node *) script);
+	if (res == DOM_HUBBUB_OK) {
+		NSLOG(netsurf, DEEPDEBUG, "Inserted script has finished running");
+	} else {
+		if (res == (DOM_HUBBUB_HUBBUB_ERR | HUBBUB_PAUSED)) {
+			NSLOG(netsurf, DEEPDEBUG, "Inserted script has launced asynchronously");
+		} else {
+			NSLOG(netsurf, DEEPDEBUG, "Failure starting script");
+		}
+	}
+}
+
 /* callback for DOMNodeInserted end type */
 static void
 dom_default_action_DOMNodeInserted_cb(struct dom_event *evt, void *pw)
@@ -693,6 +743,9 @@ dom_default_action_DOMNodeInserted_cb(struct dom_event *evt, void *pw)
 			case DOM_HTML_ELEMENT_TYPE_STYLE:
 				html_css_process_style(htmlc, (dom_node *) node);
 				break;
+			case DOM_HTML_ELEMENT_TYPE_SCRIPT:
+				dom_SCRIPT_showed_up(htmlc, (dom_html_script_element *) node);
+				break;
 			default:
 				break;
 			}
@@ -720,7 +773,39 @@ dom_default_action_DOMNodeInserted_cb(struct dom_event *evt, void *pw)
 	}
 }
 
-/* callback for DOMNodeInserted end type */
+/* callback for DOMNodeInsertedIntoDocument end type */
+static void
+dom_default_action_DOMNodeInsertedIntoDocument_cb(struct dom_event *evt, void *pw)
+{
+	html_content *htmlc = pw;
+	dom_event_target *node;
+	dom_node_type type;
+	dom_exception exc;
+
+	exc = dom_event_get_target(evt, &node);
+	if ((exc == DOM_NO_ERR) && (node != NULL)) {
+		exc = dom_node_get_node_type(node, &type);
+		if ((exc == DOM_NO_ERR) && (type == DOM_ELEMENT_NODE)) {
+			/* an element node has been modified */
+			dom_html_element_type tag_type;
+
+			exc = dom_html_element_get_tag_type(node, &tag_type);
+			if (exc != DOM_NO_ERR) {
+				tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
+			}
+
+			switch (tag_type) {
+			case DOM_HTML_ELEMENT_TYPE_SCRIPT:
+				dom_SCRIPT_showed_up(htmlc, (dom_html_script_element *) node);
+			default:
+				break;
+			}
+		}
+		dom_node_unref(node);
+	}
+}
+
+/* callback for DOMSubtreeModified end type */
 static void
 dom_default_action_DOMSubtreeModified_cb(struct dom_event *evt, void *pw)
 {
@@ -787,11 +872,13 @@ dom_event_fetcher(dom_string *type,
 		  dom_default_action_phase phase,
 		  void **pw)
 {
-	NSLOG(netsurf, DEEPDEBUG, "type:%s", dom_string_data(type));
+	NSLOG(netsurf, DEEPDEBUG, "phase:%d type:%s", phase, dom_string_data(type));
 
 	if (phase == DOM_DEFAULT_ACTION_END) {
 		if (dom_string_isequal(type, corestring_dom_DOMNodeInserted)) {
 			return dom_default_action_DOMNodeInserted_cb;
+		} else if (dom_string_isequal(type, corestring_dom_DOMNodeInsertedIntoDocument)) {
+			return dom_default_action_DOMNodeInsertedIntoDocument_cb;
 		} else if (dom_string_isequal(type, corestring_dom_DOMSubtreeModified)) {
 			return dom_default_action_DOMSubtreeModified_cb;
 		}
@@ -847,6 +934,7 @@ html_create_html_data(html_content *c, const http_parameter *params)
 
 	c->parser = NULL;
 	c->parse_completed = false;
+	c->conversion_begun = false;
 	c->document = NULL;
 	c->quirks = DOM_DOCUMENT_QUIRKS_MODE_NONE;
 	c->encoding = NULL;
@@ -948,6 +1036,7 @@ html_create_html_data(html_content *c, const http_parameter *params)
 				     (void *) &old_node_data);
 	if (err != DOM_NO_ERR) {
 		dom_hubbub_parser_destroy(c->parser);
+		c->parser = NULL;
 		nsurl_unref(c->base_url);
 		c->base_url = NULL;
 
@@ -1185,14 +1274,21 @@ bool html_can_begin_conversion(html_content *htmlc)
 {
 	unsigned int i;
 
+	/* Cannot begin conversion if we already have */
+	if (htmlc->conversion_begun)
+		return false;
+
+	/* Cannot begin conversion if we're still fetching stuff */
 	if (htmlc->base.active != 0)
 		return false;
 
 	for (i = 0; i != htmlc->stylesheet_count; i++) {
+		/* Cannot begin conversion if the stylesheets are modified */
 		if (htmlc->stylesheets[i].modified)
 			return false;
 	}
 
+	/* All is good, begin */
 	return true;
 }
 
@@ -1206,6 +1302,10 @@ html_begin_conversion(html_content *htmlc)
 	dom_string *node_name = NULL;
 	dom_hubbub_error error;
 
+	if (htmlc->conversion_begun)
+		/* Conversion already began, so we are okay */
+		return true;
+
 	/* The act of completing the parse can result in additional data
 	 * being flushed through the parser. This may result in new style or
 	 * script nodes, upon which the conversion depends. Thus, once we
@@ -1247,8 +1347,11 @@ html_begin_conversion(html_content *htmlc)
 		return false;
 	}
 
-	/* complete script execution */
-	html_script_exec(htmlc);
+	/* Conversion begins proper at this point */
+	htmlc->conversion_begun = true;
+
+	/* complete script execution, including deferred scripts */
+	html_script_exec(htmlc, true);
 
 	/* fire a simple event that bubbles named DOMContentLoaded at
 	 * the Document.
diff --git a/content/handlers/html/html_internal.h b/content/handlers/html/html_internal.h
index 77354c369..a4ae1da57 100644
--- a/content/handlers/html/html_internal.h
+++ b/content/handlers/html/html_internal.h
@@ -98,6 +98,7 @@ typedef struct html_content {
 
 	dom_hubbub_parser *parser; /**< Parser object handle */
 	bool parse_completed; /**< Whether the parse has been completed */
+	bool conversion_begun; /**< Whether or not the conversion has begun */
 
 	/** Document tree */
 	dom_document *document;
@@ -313,9 +314,10 @@ dom_hubbub_error html_process_script(void *ctx, dom_node *node);
  * http://www.whatwg.org/specs/web-apps/current-work/multipage/scripting-1.html#the-script-element
  *
  * \param htmlc html content.
+ * \param allow_defer allow deferred execution, if not, only async scripts.
  * \return NSERROR_OK error code.
  */
-nserror html_script_exec(html_content *htmlc);
+nserror html_script_exec(html_content *htmlc, bool allow_defer);
 
 /**
  * Free all script resources and references for a html content.
diff --git a/content/handlers/html/html_script.c b/content/handlers/html/html_script.c
index 80992b9dd..b404d2edf 100644
--- a/content/handlers/html/html_script.c
+++ b/content/handlers/html/html_script.c
@@ -55,7 +55,7 @@ static script_handler_t *select_script_handler(content_type ctype)
 
 
 /* exported internal interface documented in html/html_internal.h */
-nserror html_script_exec(html_content *c)
+nserror html_script_exec(html_content *c, bool allow_defer)
 {
 	unsigned int i;
 	struct html_script *s;
@@ -71,7 +71,7 @@ nserror html_script_exec(html_content *c)
 		}
 
 		if ((s->type == HTML_SCRIPT_ASYNC) ||
-		    (s->type == HTML_SCRIPT_DEFER)) {
+		    (allow_defer && (s->type == HTML_SCRIPT_DEFER))) {
 			/* ensure script content is present */
 			if (s->data.handle == NULL)
 				continue;
@@ -200,6 +200,13 @@ convert_script_async_cb(hlcache_handle *script,
 		html_begin_conversion(parent);
 	}
 
+	/* if we have already started converting though, then we can handle the
+	 * scripts as they come in.
+	 */
+	else if (parent->conversion_begun) {
+		html_script_exec(parent, false);
+	}
+
 	return NSERROR_OK;
 }
 
@@ -304,9 +311,11 @@ convert_script_sync_cb(hlcache_handle *script,
 		}
 
 		/* continue parse */
-		err = dom_hubbub_parser_pause(parent->parser, false);
-		if (err != DOM_HUBBUB_OK) {
-			NSLOG(netsurf, INFO, "unpause returned 0x%x", err);
+		if (parent->parser != NULL) {
+			err = dom_hubbub_parser_pause(parent->parser, false);
+			if (err != DOM_HUBBUB_OK) {
+				NSLOG(netsurf, INFO, "unpause returned 0x%x", err);
+			}
 		}
 
 		break;
@@ -328,9 +337,11 @@ convert_script_sync_cb(hlcache_handle *script,
 		s->already_started = true;
 
 		/* continue parse */
-		err = dom_hubbub_parser_pause(parent->parser, false);
-		if (err != DOM_HUBBUB_OK) {
-			NSLOG(netsurf, INFO, "unpause returned 0x%x", err);
+		if (parent->parser != NULL) {
+			err = dom_hubbub_parser_pause(parent->parser, false);
+			if (err != DOM_HUBBUB_OK) {
+				NSLOG(netsurf, INFO, "unpause returned 0x%x", err);
+			}
 		}
 
 		break;
@@ -402,6 +413,12 @@ exec_src_script(html_content *c,
 		return DOM_HUBBUB_OK; /* dom error */
 	}
 
+	if (c->parse_completed) {
+		/* After parse completed, all scripts are essentially async */
+		async = true;
+		defer = false;
+	}
+
 	if (async) {
 		/* asyncronous script */
 		script_type = HTML_SCRIPT_ASYNC;
diff --git a/content/handlers/javascript/duktape/Node.bnd b/content/handlers/javascript/duktape/Node.bnd
index f14cfc177..fe24b3f11 100644
--- a/content/handlers/javascript/duktape/Node.bnd
+++ b/content/handlers/javascript/duktape/Node.bnd
@@ -427,6 +427,7 @@ method Node::appendChild()
 	dom_exception err;
 	dom_node *spare;
 
+	NSLOG(dukky, DEEPDEBUG, "About to append %p to %p", other->node, priv->node);
 	err = dom_node_append_child(priv->node, other->node, &spare);
 	if (err != DOM_NO_ERR) return 0;
 	dukky_push_node(ctx, spare);
diff --git a/test/js/inserted-script-async.js b/test/js/inserted-script-async.js
new file mode 100644
index 000000000..5552e2773
--- /dev/null
+++ b/test/js/inserted-script-async.js
@@ -0,0 +1 @@
+console.log("External asynchronous dynamism!");
diff --git a/test/js/inserted-script-defer.js b/test/js/inserted-script-defer.js
new file mode 100644
index 000000000..2d89edd34
--- /dev/null
+++ b/test/js/inserted-script-defer.js
@@ -0,0 +1 @@
+console.log("External deferred dynamism!");
diff --git a/test/js/inserted-script.html b/test/js/inserted-script.html
new file mode 100644
index 000000000..b1c381aaa
--- /dev/null
+++ b/test/js/inserted-script.html
@@ -0,0 +1,39 @@
+<html>
+  <head>
+    <title>Inserted script test</title>
+    <script>
+      /* After one second, insert an inline script element */
+      setTimeout(function() {
+      var div = document.createElement("DIV");
+      var script = document.createElement("SCRIPT");
+      var textnode = document.createTextNode("console.log(\"Dynamism\");");
+      script.appendChild(textnode);
+      div.appendChild(script);
+      document.body.appendChild(div);
+      }, 1000);
+      /* After two seconds, insert a script element for immediate fetch */
+      setTimeout(function() {
+      var script = document.createElement("SCRIPT");
+      script.setAttribute("src", "inserted-script.js");
+      document.body.appendChild(script);
+      }, 2000);
+      /* After three seconds, insert a script element for async fetch */
+      setTimeout(function() {
+      var script = document.createElement("SCRIPT");
+      script.setAttribute("src", "inserted-script-async.js");
+      script.setAttribute("async", "");
+      document.body.appendChild(script);
+      }, 3000);
+      /* After four seconds, insert a script element for deferred fetch */
+      setTimeout(function() {
+      var script = document.createElement("SCRIPT");
+      script.setAttribute("src", "inserted-script-defer.js");
+      script.setAttribute("defer", "");
+      document.body.appendChild(script);
+      }, 4000);
+    </script>
+  </head>
+  <body>
+    Check the log
+  </body>
+</html>
diff --git a/test/js/inserted-script.js b/test/js/inserted-script.js
new file mode 100644
index 000000000..f3a954827
--- /dev/null
+++ b/test/js/inserted-script.js
@@ -0,0 +1 @@
+console.log("External dynamism!");