src/vs/editor/browser/controller/textAreaHandler.ts/TextAreaHandler/_renderAtTopLeft
class TextAreaHandler:	private _renderAtTopLeft(): void {
		// (in WebKit the textarea is 1px by 1px because it cannot handle input to a 0x0 textarea)
		// specifically, when doing Korean IME, setting the textarea to 0x0 breaks IME badly.
		this._doRender({
			lastRenderPosition: null,
			top: 0,
			left: 0,
			width: (canUseZeroSizeTextarea ? 0 : 1),
			height: (canUseZeroSizeTextarea ? 0 : 1),
			useCover: true
		});
	}