replace_html & DPI Scaling support

code/modules/tgui/tgui_window.dm

@@ -298,6 +298,17 @@
 			: "[id].browser:update")
 	message_queue = null
 
+/**
+ * public
+ *
+ * Replaces the inline HTML content.
+ *
+ * required inline_html string HTML to inject
+ */
+/datum/tgui_window/proc/replace_html(inline_html = "")
+	client << output(url_encode(inline_html), is_browser \
+		? "[id]:replaceHtml" \
+		: "[id].browser:replaceHtml")
 
 /**
  * private

code/modules/tooltip/tooltip.html

@@ -217,8 +217,13 @@
 
 				$wrap.width($wrap.width() + 2); //Dumb hack to fix a bizarre sizing bug
 
-				var docWidth	= $wrap.outerWidth(),
-					docHeight	= $wrap.outerHeight();
+				var pixelRatio = 1;
+				if (window.devicePixelRatio) {
+					pixelRatio = window.devicePixelRatio;
+				}
+
+				var docWidth	= Math.floor($wrap.outerWidth() * pixelRatio),
+					docHeight	= Math.floor($wrap.outerHeight() * pixelRatio);
 
 				if (posY + docHeight > map.size.y) { //Is the bottom edge below the window? Snap it up if so
 					posY = (posY - docHeight) - realIconSize - tooltip.padding;