src/vs/workbench/contrib/extensions/browser/extensionEditor.ts/PreReleaseTextWidget/constructor
class PreReleaseTextWidget:	constructor(container: HTMLElement) {
		super();
		this.element = append(container, $('span.pre-release'));
		append(this.element, $('span' + ThemeIcon.asCSSSelector(preReleaseIcon)));
		const textElement = append(this.element, $('span.pre-release-text'));
		textElement.textContent = localize('preRelease', "Pre-Release");
		this.render();
	}