extensions/markdown-language-features/src/preview/previewContentProvider.ts/MarkdownContentProvider/getStyles
class MarkdownContentProvider:	private getStyles(resourceProvider: WebviewResourceProvider, resource: vscode.Uri, config: MarkdownPreviewConfiguration, state?: any): string {
		const baseStyles: string[] = [];
		for (const resource of this.contributionProvider.contributions.previewStyles) {
			baseStyles.push(`<link rel="stylesheet" type="text/css" href="${escapeAttribute(resourceProvider.asWebviewUri(resource))}">`);
		}

		return `${baseStyles.join('\n')}
			${this.computeCustomStyleSheetIncludes(resourceProvider, resource, config)}
			${this.getImageStabilizerStyles(state)}`;
	}