From 385c936318943a07269e42e9f5af20cb8f47156a Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Mon, 9 Feb 2026 11:50:47 +0100
Subject: [PATCH] [api-minor] Update the minimum supported Google Chrome
 version to 118

This patch updates the minimum supported browsers as follows:
 - Google Chrome 118, which was released on 2023-10-10; see https://chromereleases.googleblog.com/2023/10/stable-channel-update-for-desktop_10.html

We haven't made any changes to the supported Google Chrome version for a year, and this change allows us to remove "hacks" needed to support `float: inline-start/inline-end` in old browsers; see https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/float#browser_compatibility.

Note that nowadays we usually try, where feasible and possible, to support browsers that are about two years old. By limiting support to only "recent" browsers we reduce the risk of holding back improvements of the *built-in* Firefox PDF Viewer, and also (significantly) reduce the maintenance/support burden for the PDF.js contributors.

*Please note:* As always, the minimum supported browser version assumes that a `legacy`-build of the PDF.js library is being used; see https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#faq-support
---
 .stylelintrc   |  3 ---
 gulpfile.mjs   |  8 +-------
 web/tree.css   |  2 +-
 web/viewer.css | 10 +---------
 4 files changed, 3 insertions(+), 20 deletions(-)

diff --git a/.stylelintrc b/.stylelintrc
index c705193f8a919..3edcadaadbb0a 100644
--- a/.stylelintrc
+++ b/.stylelintrc
@@ -13,9 +13,6 @@
     "color-no-invalid-hex": true,
     "declaration-block-no-duplicate-properties": true,
     "declaration-block-no-redundant-longhand-properties": true,
-    "declaration-property-value-disallowed-list": {
-      "float": ["inline-start", "inline-end"]
-    },
     "length-zero-no-unit": [true, {
       "ignore": ["custom-properties"]
     }],
diff --git a/gulpfile.mjs b/gulpfile.mjs
index 673252d417ef4..46a339770dcdb 100644
--- a/gulpfile.mjs
+++ b/gulpfile.mjs
@@ -82,7 +82,7 @@ const config = JSON.parse(fs.readFileSync(CONFIG_FILE).toString());
 
 const ENV_TARGETS = [
   "last 2 versions",
-  "Chrome >= 110",
+  "Chrome >= 118",
   "Firefox ESR",
   "Safari >= 16.4",
   "Node >= 20",
@@ -1297,10 +1297,6 @@ function createDefaultPrefsFile() {
   return createStringSource(defaultFileName, buf.join("\n"));
 }
 
-function replaceMozcentralCSS() {
-  return replace(/var\(--(inline-(?:start|end))\)/g, "$1");
-}
-
 gulp.task(
   "mozcentral",
   gulp.series(
@@ -1376,7 +1372,6 @@ gulp.task(
               autoprefixer(MOZCENTRAL_AUTOPREFIXER_CONFIG),
             ])
           )
-          .pipe(replaceMozcentralCSS())
           .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),
 
         preprocessCSS("web/viewer-geckoview.css", gvDefines)
@@ -1386,7 +1381,6 @@ gulp.task(
               autoprefixer(MOZCENTRAL_AUTOPREFIXER_CONFIG),
             ])
           )
-          .pipe(replaceMozcentralCSS())
           .pipe(gulp.dest(MOZCENTRAL_CONTENT_DIR + "web")),
 
         gulp
diff --git a/web/tree.css b/web/tree.css
index 2dd628dc4b76e..346b62c1d1308 100644
--- a/web/tree.css
+++ b/web/tree.css
@@ -46,7 +46,7 @@
       }
 
       position: relative;
-      float: var(--inline-start);
+      float: inline-start;
       height: 0;
       width: 0;
       color: rgb(255 255 255 / 0.5);
diff --git a/web/viewer.css b/web/viewer.css
index 17dd46b38fdd7..f2e313a1351f6 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -17,10 +17,6 @@
 
 :root {
   --dir-factor: 1;
-  /*#if !MOZCENTRAL*/
-  --inline-start: left;
-  --inline-end: right;
-  /*#endif*/
 
   --sidebar-width: 200px;
   --sidebar-transition-duration: 200ms;
@@ -132,10 +128,6 @@
 
 :root:dir(rtl) {
   --dir-factor: -1;
-  /*#if !MOZCENTRAL*/
-  --inline-start: right;
-  --inline-end: left;
-  /*#endif*/
 }
 
 @media screen and (forced-colors: active) {
@@ -417,7 +409,7 @@ body {
 }
 
 .splitToolbarButtonSeparator {
-  float: var(--inline-start);
+  float: inline-start;
   width: 0;
   height: 62%;
   border-left: 1px solid var(--separator-color);