diff --git a/administrator/language/en-GB/en-GB.plg_editors_tinymce.ini b/administrator/language/en-GB/en-GB.plg_editors_tinymce.ini
index af49565977952..534757aae0c24 100644
--- a/administrator/language/en-GB/en-GB.plg_editors_tinymce.ini
+++ b/administrator/language/en-GB/en-GB.plg_editors_tinymce.ini
@@ -52,6 +52,7 @@ PLG_TINY_FIELD_FUNCTIONALITY_DESC="Select level of functionality."
 PLG_TINY_FIELD_FUNCTIONALITY_LABEL="Functionality"
 PLG_TINY_FIELD_HR_DESC="Show or hide the Horizontal Rule button."
 PLG_TINY_FIELD_HR_LABEL="Horizontal Rule"
+; The following 4 strings are deprecated and will be removed with 4.0
 PLG_TINY_FIELD_HTMLHEIGHT_DESC="Height of HTML editor. Only applies in Advanced and Extended mode."
 PLG_TINY_FIELD_HTMLHEIGHT_LABEL="HTML Height"
 PLG_TINY_FIELD_HTMLWIDTH_DESC="Width of HTML editor. Should normally be left empty to let it flow. Only applies in Advanced and Extended mode."
diff --git a/plugins/editors/tinymce/tinymce.php b/plugins/editors/tinymce/tinymce.php
index 79c4dbe878dc0..887cea66967b5 100644
--- a/plugins/editors/tinymce/tinymce.php
+++ b/plugins/editors/tinymce/tinymce.php
@@ -168,6 +168,16 @@ public function onDisplay(
 		$doc     = JFactory::getDocument();
 		$options = $doc->getScriptOptions('plg_editor_tinymce');
 
+		if (empty($width))
+		{
+			$width = "100%";
+		}
+
+		if (empty($height))
+		{
+			$height = "500px";
+		}
+
 		// Only add "px" to width and height if they are not given as a percentage
 		if (is_numeric($width))
 		{
@@ -406,14 +416,6 @@ public function onDisplay(
 			$valid_elements    = trim($levelParams->get('valid_elements', ''));
 		}
 
-		$html_height = $this->params->get('html_height', '550');
-		$html_width  = $this->params->get('html_width', '');
-
-		if ($html_width == 750)
-		{
-			$html_width = '';
-		}
-
 		// The param is true for vertical resizing only, false or both
 		$resizing          = (bool) $levelParams->get('resizing', true);
 		$resize_horizontal = (bool) $levelParams->get('resize_horizontal', true);
@@ -660,8 +662,6 @@ public function onDisplay(
 			'paste_data_images'  => $allowImgPaste,
 			'importcss_append'   => true,
 			'image_title'        => true,
-			'height'             => $html_height,
-			'width'              => $html_width,
 			'resize'             => $resizing,
 			'templates'          => $templates,
 			'image_advtab'       => (bool) $levelParams->get('image_advtab', false),
diff --git a/plugins/editors/tinymce/tinymce.xml b/plugins/editors/tinymce/tinymce.xml
index 5e0c759068226..69aa7bbed397c 100644
--- a/plugins/editors/tinymce/tinymce.xml
+++ b/plugins/editors/tinymce/tinymce.xml
@@ -39,21 +39,7 @@
 					description="PLG_TINY_FIELD_NUMBER_OF_SETS_DESC"
 					default="3"
 				/>
-				<field
-					name="html_height"
-					type="text"
-					label="PLG_TINY_FIELD_HTMLHEIGHT_LABEL"
-					description="PLG_TINY_FIELD_HTMLHEIGHT_DESC"
-					default="550"
-				/>
 
-				<field
-					name="html_width"
-					type="text"
-					label="PLG_TINY_FIELD_HTMLWIDTH_LABEL"
-					description="PLG_TINY_FIELD_HTMLWIDTH_DESC"
-					default=""
-				/>
 			</fieldset>
 		</fields>
 	</config>