Revert "Merge pull request xtermjs#4611 from SimonSiefke/constructed-…

…stylesheets"

This reverts commit 5889344, reversing
changes made to 679c149.

src/browser/renderer/dom/DomRenderer.ts

@@ -14,7 +14,6 @@ import { color } from 'common/Color';
 import { EventEmitter } from 'common/EventEmitter';
 import { Disposable, toDisposable } from 'common/Lifecycle';
 import { IBufferService, IInstantiationService, IOptionsService } from 'common/services/Services';
-import { createStyle, IStyleSheet } from './StyleSheet';
 
 
 const TERMINAL_CLASS_PREFIX = 'xterm-dom-renderer-owner-';
@@ -36,8 +35,8 @@ export class DomRenderer extends Disposable implements IRenderer {
   private _rowFactory: DomRendererRowFactory;
   private _terminalClass: number = nextTerminalId++;
 
-  private _themeStyle!: IStyleSheet;
-  private _dimensionsStyle!: IStyleSheet;
+  private _themeStyleElement!: HTMLStyleElement;
+  private _dimensionsStyleElement!: HTMLStyleElement;
   private _rowContainer: HTMLElement;
   private _rowElements: HTMLElement[] = [];
   private _selectionContainer: HTMLElement;
@@ -92,9 +91,9 @@ export class DomRenderer extends Disposable implements IRenderer {
       // https://github.com/xtermjs/xterm.js/issues/2960
       this._rowContainer.remove();
       this._selectionContainer.remove();
-      this._themeStyle.dispose();
-      this._dimensionsStyle.dispose();
       this._widthCache.dispose();
+      this._themeStyleElement.remove();
+      this._dimensionsStyleElement.remove();
     }));
 
     this._widthCache = new WidthCache(document);
@@ -130,8 +129,9 @@ export class DomRenderer extends Disposable implements IRenderer {
       element.style.overflow = 'hidden';
     }
 
-    if (!this._dimensionsStyle) {
-      this._dimensionsStyle = createStyle(this._screenElement);
+    if (!this._dimensionsStyleElement) {
+      this._dimensionsStyleElement = document.createElement('style');
+      this._screenElement.appendChild(this._dimensionsStyleElement);
     }
 
     const styles =
@@ -141,16 +141,17 @@ export class DomRenderer extends Disposable implements IRenderer {
       ` vertical-align: top;` +
       `}`;
 
-    this._dimensionsStyle.setCss(styles);
+    this._dimensionsStyleElement.textContent = styles;
 
     this._selectionContainer.style.height = this._viewportElement.style.height;
     this._screenElement.style.width = `${this.dimensions.css.canvas.width}px`;
     this._screenElement.style.height = `${this.dimensions.css.canvas.height}px`;
   }
 
   private _injectCss(colors: ReadonlyColorSet): void {
-    if (!this._themeStyle) {
-      this._themeStyle = createStyle(this._screenElement);
+    if (!this._themeStyleElement) {
+      this._themeStyleElement = document.createElement('style');
+      this._screenElement.appendChild(this._themeStyleElement);
     }
 
     // Base CSS
@@ -248,7 +249,7 @@ export class DomRenderer extends Disposable implements IRenderer {
       `${this._terminalSelector} .${FG_CLASS_PREFIX}${INVERTED_DEFAULT_COLOR}.${RowCss.DIM_CLASS} { color: ${color.multiplyOpacity(color.opaque(colors.background), 0.5).css}; }` +
       `${this._terminalSelector} .${BG_CLASS_PREFIX}${INVERTED_DEFAULT_COLOR} { background-color: ${colors.foreground.css}; }`;
 
-    this._themeStyle.setCss(styles);
+    this._themeStyleElement.textContent = styles;
   }
 
   /**