code: function updateCSSNode(editor, srcProp, width, height) {
  	const rule = srcProp.parent;
  	const widthProp = getProperty(rule, 'width');
  	const heightProp = getProperty(rule, 'height');
  
  	// Detect formatting
  	const separator = srcProp.separator || ': ';
  	const before = getBefore(editor, srcProp);
  	const insertOpt = { autoIndent: false };
  
  	editor.transact(() => {
  		// Apply changes from right to left, first for height, then for width
  
  		if (!heightProp) {
  			// no `height` property, add it right after `width` or source property
  			editor.setCursorBufferPosition(widthProp ? widthProp.end : srcProp.end);
  			editor.insertText(`${before}height${separator}${height}px;`, insertOpt);
  		} else {
  			editor.setTextInBufferRange(getRange(heightProp.valueToken), `${height}px`);
  		}
  
  		if (!widthProp) {
  			// no `width` attribute, add it right after `height` or source property
  			if (heightProp) {
  				editor.setCursorBufferPosition(heightProp.previousSibling
  					? heightProp.previousSibling.end
  					: rule.contentStart.end);
  			} else {
  				editor.setCursorBufferPosition(srcProp.end);
  			}
  			editor.insertText(`${before}width${separator}${width}px;`, insertOpt);
  		} else {
  			editor.setTextInBufferRange(getRange(widthProp.valueToken), `${width}px`);
  		}
  	});
  }
docs: Updates size of given CSS rule
  @param  {TextEditor} editor
  @param  {Node}       srcProp
  @param  {Number}     width
  @param  {Number}     height