refactor(core): remove IE11 only sanitization code (#48438)

As IE11 support has been drop with v13, this specific code isn't needed anymore.

PR Close #48438

goldens/size-tracking/aio-payloads.json

@@ -12,7 +12,7 @@
   "aio-local": {
     "uncompressed": {
       "runtime": 4325,
-      "main": 466201,
+      "main": 465606,
       "polyfills": 33836,
       "styles": 74561,
       "light-theme": 92890,

goldens/size-tracking/integration-payloads.json

@@ -26,7 +26,7 @@
   "cli-hello-world-ivy-i18n": {
     "uncompressed": {
       "runtime": 926,
-      "main": 124195,
+      "main": 123543,
       "polyfills": 34628
     }
   },

packages/core/src/sanitization/inert_body.ts

@@ -59,8 +59,7 @@ class DOMParserHelper implements InertBodyHelper {
 }
 
 /**
- * Use an HTML5 `template` element, if supported, or an inert body element created via
- * `createHtmlDocument` to create and fill an inert DOM element.
+ * Use an HTML5 `template` element to create and fill an inert DOM element.
  * This is the fallback strategy if the browser does not support DOMParser.
  */
 class InertDocumentHelper implements InertBodyHelper {
@@ -68,67 +67,12 @@ class InertDocumentHelper implements InertBodyHelper {
 
   constructor(private defaultDoc: Document) {
     this.inertDocument = this.defaultDoc.implementation.createHTMLDocument('sanitization-inert');
-
-    if (this.inertDocument.body == null) {
-      // usually there should be only one body element in the document, but IE doesn't have any, so
-      // we need to create one.
-      const inertHtml = this.inertDocument.createElement('html');
-      this.inertDocument.appendChild(inertHtml);
-      const inertBodyElement = this.inertDocument.createElement('body');
-      inertHtml.appendChild(inertBodyElement);
-    }
   }
 
   getInertBodyElement(html: string): HTMLElement|null {
-    // Prefer using <template> element if supported.
     const templateEl = this.inertDocument.createElement('template');
-    if ('content' in templateEl) {
-      templateEl.innerHTML = trustedHTMLFromString(html) as string;
-      return templateEl;
-    }
-
-    // Note that previously we used to do something like `this.inertDocument.body.innerHTML = html`
-    // and we returned the inert `body` node. This was changed, because IE seems to treat setting
-    // `innerHTML` on an inserted element differently, compared to one that hasn't been inserted
-    // yet. In particular, IE appears to split some of the text into multiple text nodes rather
-    // than keeping them in a single one which ends up messing with Ivy's i18n parsing further
-    // down the line. This has been worked around by creating a new inert `body` and using it as
-    // the root node in which we insert the HTML.
-    const inertBody = this.inertDocument.createElement('body');
-    inertBody.innerHTML = trustedHTMLFromString(html) as string;
-
-    // Support: IE 11 only
-    // strip custom-namespaced attributes on IE<=11
-    if ((this.defaultDoc as any).documentMode) {
-      this.stripCustomNsAttrs(inertBody);
-    }
-
-    return inertBody;
-  }
-
-  /**
-   * When IE11 comes across an unknown namespaced attribute e.g. 'xlink:foo' it adds 'xmlns:ns1'
-   * attribute to declare ns1 namespace and prefixes the attribute with 'ns1' (e.g.
-   * 'ns1:xlink:foo').
-   *
-   * This is undesirable since we don't want to allow any of these custom attributes. This method
-   * strips them all.
-   */
-  private stripCustomNsAttrs(el: Element) {
-    const elAttrs = el.attributes;
-    // loop backwards so that we can support removals.
-    for (let i = elAttrs.length - 1; 0 < i; i--) {
-      const attrib = elAttrs.item(i);
-      const attrName = attrib!.name;
-      if (attrName === 'xmlns:ns1' || attrName.indexOf('ns1:') === 0) {
-        el.removeAttribute(attrName);
-      }
-    }
-    let childNode = el.firstChild as Node | null;
-    while (childNode) {
-      if (childNode.nodeType === Node.ELEMENT_NODE) this.stripCustomNsAttrs(childNode as Element);
-      childNode = childNode.nextSibling;
-    }
+    templateEl.innerHTML = trustedHTMLFromString(html) as string;
+    return templateEl;
   }
 }