From 123fbb123099f166e7632e8112dda9c7dc3d1bcf Mon Sep 17 00:00:00 2001
From: Ian Thomas <ianthomas23@gmail.com>
Date: Fri, 31 Jul 2026 19:08:46 +0100
Subject: [PATCH] Backport PR #32149: Always set device pixel ratio on
 WebSocket open in WebAgg

---
 lib/matplotlib/backends/web_backend/js/mpl.js | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/lib/matplotlib/backends/web_backend/js/mpl.js b/lib/matplotlib/backends/web_backend/js/mpl.js
index 7745cbcf1e98..7a6a650716c3 100644
--- a/lib/matplotlib/backends/web_backend/js/mpl.js
+++ b/lib/matplotlib/backends/web_backend/js/mpl.js
@@ -64,11 +64,9 @@ mpl.figure = function (figure_id, websocket, ondownload, parent_element) {
     this.ws.onopen = function () {
         fig.send_message('supports_binary', { value: fig.supports_binary });
         fig.send_message('send_image_mode', {});
-        if (fig.ratio !== 1) {
-            fig.send_message('set_device_pixel_ratio', {
-                device_pixel_ratio: fig.ratio,
-            });
-        }
+        fig.send_message('set_device_pixel_ratio', {
+            device_pixel_ratio: fig.ratio,
+        });
         fig.send_message('refresh', {});
     };