src/generators/dom/Block.js/Block/addElement
class Block:	addElement ( name, renderStatement, parentNode, needsIdentifier = false ) {
		const isToplevel = !parentNode;
		if ( needsIdentifier || isToplevel ) {
			this.builders.create.addLine(
				`var ${name} = ${renderStatement};`
			);

			this.mount( name, parentNode );
		} else {
			this.builders.create.addLine( `${this.generator.helper( 'appendNode' )}( ${renderStatement}, ${parentNode} );` );
		}

		if ( isToplevel ) {
			this.builders.detach.addLine( `${this.generator.helper( 'detachNode' )}( ${name} );` );
		}
	}