src/vs/base/browser/ui/progressbar/progressbar.ts/ProgressBar/create
class ProgressBar:	private create(container: HTMLElement): void {
		this.element = document.createElement('div');
		this.element.classList.add('monaco-progress-container');
		this.element.setAttribute('role', 'progressbar');
		this.element.setAttribute('aria-valuemin', '0');
		container.appendChild(this.element);

		this.bit = document.createElement('div');
		this.bit.classList.add('progress-bit');
		this.element.appendChild(this.bit);

		this.applyStyles();
	}