diff --git a/plugins/editors/tinymce/tinymce.php b/plugins/editors/tinymce/tinymce.php
index 79c4dbe878dc0..99d56c40c630c 100644
--- a/plugins/editors/tinymce/tinymce.php
+++ b/plugins/editors/tinymce/tinymce.php
@@ -406,12 +406,24 @@ public function onDisplay(
 			$valid_elements    = trim($levelParams->get('valid_elements', ''));
 		}
 
-		$html_height = $this->params->get('html_height', '550');
-		$html_width  = $this->params->get('html_width', '');
+		// Compare the value with what is set in JFormFieldEditor::setup()
+		if ($height && $height !== '500px')
+		{
+			$html_height = $height;
+		}
+		else
+		{
+			$html_height = $this->params->get('html_height', '500');
+		}
 
-		if ($html_width == 750)
+		// Compare the value with what is set in JFormFieldEditor::setup()
+		if ($width && $width !== '100%')
 		{
-			$html_width = '';
+			$html_width = $width;
+		}
+		else
+		{
+			$html_width = $this->params->get('html_width', '750');
 		}
 
 		// The param is true for vertical resizing only, false or both