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Added solution to Add a Hover Effect to a D3 Element (#19606)

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* Update index.md

* Update index.md
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2018-10-17 22:12:38 +05:30
committed by Aditya
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guide/english/certifications/data-visualization/data-visualization-with-d3/add-a-hover-effect-to-a-d3-element/index.md
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@ -3,8 +3,18 @@ title: Add a Hover Effect to a D3 Element
---
## Add a Hover Effect to a D3 Element
This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/certifications/data-visualization/data-visualization-with-d3/add-a-hover-effect-to-a-d3-element/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
### Hint 1
<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
Add the ` bar ` class to all `rect ` elements.
<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
### Hint 2
Use the ` attr() ` method to add attributes.
### Solution
Add the following line of code to the end of your ` rect ` methods chain:
```javascript
.attr("class","bar");
```