extensions/markdown-language-features/src/preview/preview.ts/MarkdownPreview/updateWebviewContent
class MarkdownPreview:	private updateWebviewContent(html: string, reloadPage: boolean): void {
		if (this._disposed) {
			return;
		}

		if (this.delegate.getTitle) {
			this._webviewPanel.title = this.delegate.getTitle(this._resource);
		}
		this._webviewPanel.webview.options = this.getWebviewOptions();

		if (reloadPage) {
			this._webviewPanel.webview.html = html;
		} else {
			this._webviewPanel.webview.postMessage({
				type: 'updateContent',
				content: html,
				source: this._resource.toString(),
			});
		}
	}