From babeae9448f3d1e032f00027f3ca50f91ca2aac4 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 6 Sep 2020 18:24:17 +0200
Subject: [PATCH] Remove, manually implemented, DOM polyfills only necessary
 for IE 11 support

Please refer to the following compatibility information:
 - https://developer.mozilla.org/en-US/docs/Web/API/ChildNode/remove#Browser_compatibility
 - https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/add#Browser_compatibility
 - https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/remove#Browser_compatibility
 - https://developer.mozilla.org/en-US/docs/Web/API/DOMTokenList/toggle#Browser_compatibility

Finally, for the `pushState`/`replaceState` polyfills, please refer to PRs 10461 and 11318 for additional details.
---
 src/shared/compatibility.js | 92 -------------------------------------
 1 file changed, 92 deletions(-)

diff --git a/src/shared/compatibility.js b/src/shared/compatibility.js
index 05bec1e95..044997400 100644
--- a/src/shared/compatibility.js
+++ b/src/shared/compatibility.js
@@ -29,11 +29,6 @@ if (
   }
   globalThis._pdfjsCompatibilityChecked = true;
 
-  const hasDOM = typeof window === "object" && typeof document === "object";
-  const userAgent =
-    (typeof navigator !== "undefined" && navigator.userAgent) || "";
-  const isIE = /Trident/.test(userAgent);
-
   // Support: Node.js
   (function checkNodeBtoa() {
     if (globalThis.btoa || !isNodeJS) {
@@ -56,93 +51,6 @@ if (
     };
   })();
 
-  // Provides support for ChildNode.remove in legacy browsers.
-  // Support: IE.
-  (function checkChildNodeRemove() {
-    if (!hasDOM) {
-      return;
-    }
-    if (typeof Element.prototype.remove !== "undefined") {
-      return;
-    }
-    Element.prototype.remove = function () {
-      if (this.parentNode) {
-        // eslint-disable-next-line mozilla/avoid-removeChild
-        this.parentNode.removeChild(this);
-      }
-    };
-  })();
-
-  // Provides support for DOMTokenList.prototype.{add, remove}, with more than
-  // one parameter, in legacy browsers.
-  // Support: IE
-  (function checkDOMTokenListAddRemove() {
-    if (!hasDOM || isNodeJS) {
-      return;
-    }
-    const div = document.createElement("div");
-    div.classList.add("testOne", "testTwo");
-
-    if (
-      div.classList.contains("testOne") === true &&
-      div.classList.contains("testTwo") === true
-    ) {
-      return;
-    }
-    const OriginalDOMTokenListAdd = DOMTokenList.prototype.add;
-    const OriginalDOMTokenListRemove = DOMTokenList.prototype.remove;
-
-    DOMTokenList.prototype.add = function (...tokens) {
-      for (const token of tokens) {
-        OriginalDOMTokenListAdd.call(this, token);
-      }
-    };
-    DOMTokenList.prototype.remove = function (...tokens) {
-      for (const token of tokens) {
-        OriginalDOMTokenListRemove.call(this, token);
-      }
-    };
-  })();
-
-  // Provides support for DOMTokenList.prototype.toggle, with the optional
-  // "force" parameter, in legacy browsers.
-  // Support: IE
-  (function checkDOMTokenListToggle() {
-    if (!hasDOM || isNodeJS) {
-      return;
-    }
-    const div = document.createElement("div");
-    if (div.classList.toggle("test", 0) === false) {
-      return;
-    }
-
-    DOMTokenList.prototype.toggle = function (token) {
-      const force =
-        arguments.length > 1 ? !!arguments[1] : !this.contains(token);
-      return this[force ? "add" : "remove"](token), force;
-    };
-  })();
-
-  // Provides support for window.history.{pushState, replaceState}, with the
-  // `url` parameter set to `undefined`, without breaking the document URL.
-  // Support: IE
-  (function checkWindowHistoryPushStateReplaceState() {
-    if (!hasDOM || !isIE) {
-      return;
-    }
-    const OriginalPushState = window.history.pushState;
-    const OriginalReplaceState = window.history.replaceState;
-
-    window.history.pushState = function (state, title, url) {
-      const args = url === undefined ? [state, title] : [state, title, url];
-      OriginalPushState.apply(this, args);
-    };
-    window.history.replaceState = function (state, title, url) {
-      const args = url === undefined ? [state, title] : [state, title, url];
-      OriginalReplaceState.apply(this, args);
-    };
-  })();
-
   // Provides support for String.prototype.startsWith in legacy browsers.
   // Support: IE, Chrome<41
   (function checkStringStartsWith() {