src/vs/editor/browser/services/abstractCodeEditorService.ts/DecorationCSSRules/getCSSTextForModelDecorationGlyphMarginClassName
class DecorationCSSRules:	private getCSSTextForModelDecorationGlyphMarginClassName(opts: IThemeDecorationRenderOptions | undefined): string {
		if (!opts) {
			return '';
		}
		const cssTextArr: string[] = [];

		if (typeof opts.gutterIconPath !== 'undefined') {
			cssTextArr.push(strings.format(_CSS_MAP.gutterIconPath, dom.asCSSUrl(URI.revive(opts.gutterIconPath))));
			if (typeof opts.gutterIconSize !== 'undefined') {
				cssTextArr.push(strings.format(_CSS_MAP.gutterIconSize, opts.gutterIconSize));
			}
		}

		return cssTextArr.join('');
	}