---
title: "Onsite Experiment: Apply to All"
slug: "onsite-experiment-element-selector"
tags: ["copy css selector", "copy css selector on chrome", "element selector", "onsite experiment"]
updated: 2026-04-24T06:21:34Z
published: 2026-04-24T06:21:34Z
canonical: "academy.insiderone.com/onsite-experiment-element-selector"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://academy.insiderone.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Onsite Experiment: Element Selector

Coding an element’s CSS in the Element Selector allows you to transfer all modifications made to one element to other elements.

To copy the CSS selector on the Chrome browser:

1. Inspect the particular Element you want to add to your website, then click the right mouse button on the related div.
2. Click **Copy** > **Copy Selector** and paste it in the Element Selector field on the Action Builder.

![](https://cdn.document360.io/c6df4583-da94-4cb2-bb8a-be0cbdd11109/Images/Documentation/sel.gif)

> [!NOTE]
> For Onsite Experiment campaigns, if the campaign appears correct in the Action Builder but displays incorrectly during testing, it is likely because other campaigns added to the site can cause the element to which you applied changes to become unfindable. To prevent this, it is recommended that you use the Element Selector feature to select the exact element you want to adjust accurately.

## Related

- [Create an Onsite Experiment Campaign](/create-an-onsite-experiment-campaign.md)