Bug InvalidArgumentException for XPATH

Need to investigate why code: 

```java
open("chrome://settings/downloads");
var nestedShadow = $("settings-ui >> settings-main >> .//settings-basic-page");
```

throws:
```
Find Element Failed at index: 2 ->
  settings-ui >> settings-main >> .//settings-basic-page
                                  ^
                                  InvalidArgumentException
```