> For the complete documentation index, see [llms.txt](https://docs.zerowork.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zerowork.io/using-zerowork/using-selectors/how-to-build-custom-selectors/check-if-selector-is-correct-and-unique.md).

# Check if Selector Is Correct and Unique

Here is how you can check whether a selector is correct and unique before you run your TaskBot.

Open Chrome DevTools by right-clicking any spot on the webpage and selecting *Inspect*. 

![](https://3220183989-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fg9LcR8XM7TGOzOCDGsCS%2Fuploads%2Fwlo3bSijMCWgN2xKg0HQ%2FScreenshot%202022-04-06%20at%2021.00.44.png?alt=media\&token=6e17732b-de81-49ca-b98f-ff63a1195d1f)

Now enter the following command in the **Console** tab:

<mark style="background-color:yellow;">document.querySelectorAll("PASTE YOUR SELECTOR HERE")</mark>

In the example of Wikipedia's search button, it can be, for example, this selector (but you can use any other from the list you saw in the previous chapter [One Element Can Have Many Selector Expressions](/using-zerowork/using-selectors/how-to-build-custom-selectors/one-element-can-have-many-selector-expressions.md)):

<mark style="background-color:yellow;">document.querySelectorAll("button\[class\*='button']\[type='submit']")</mark>

This is what it looks like in action:

![](https://3220183989-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fg9LcR8XM7TGOzOCDGsCS%2Fuploads%2Ft7aVct4DZYXqCaVO5pWR%2FScreenshot%202022-04-06%20at%2021.03.34.png?alt=media\&token=7d499560-638d-4e71-bb6d-90ac3219873d)

Once you hit *Enter*, you will see that there is an element shown:

![](https://3220183989-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fg9LcR8XM7TGOzOCDGsCS%2Fuploads%2FoLzpkUO4E27RzO0FwTEE%2FScreenshot%202022-04-06%20at%2021.03.34%20copy.png?alt=media\&token=a42c471b-2d33-48c6-bac5-2bce7a339826)

Once you expand the shown element and hover over it, you will see the button highlighted on the left side that is identified by that selector.

![](https://3220183989-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Fg9LcR8XM7TGOzOCDGsCS%2Fuploads%2FnWXqQOT0dSiJXnUKwH39%2FScreenshot%202022-04-06%20at%2021.06.34.png?alt=media\&token=092998fb-34c9-4b14-8672-d1fc524c6f69)

If your selector is not unique enough, the result will contain multiple elements. This means you need to make the selector more specific. **Exception**: Unless you are building a selector for a list (such as list of profiles, list of pages, etc.) — in this case keep reading this guide (lists will be explained in the section[Lists: Incremental CSS Selectors](/using-zerowork/using-selectors/how-to-build-custom-selectors/lists-incremental-css-selectors.md)).

If the result does not show anything, your selector does not match any element or contains a typo. You need to try again, adjust it or build another one.

When you build your own selectors, always first check them with *document.querySelectorAll* directly on the website. This way you can avoid running your TaskBot every time you want to check validity of your custom built selector. It can save you some time.

{% hint style="warning" %}
Note that you cannot check correctness of text= (see [Use Element's Text](/using-zerowork/using-selectors/use-elements-text.md)) with *document.querySelectorAll* because this method is unique to ZeroWork.
{% endhint %}

### **Video Tutorial: Use document.querySelectorAll to Check Selector's Correctness and Uniqueness**

{% embed url="<https://youtu.be/hHAEaaxHEUI>" %}