---
id: 587d7faa367417b2b2512bd6
title: Add a Tooltip to a D3 Element
challengeType: 6
forumTopicId: 301470
---
## Description
A tooltip shows more information about an item on a page when the user hovers over that item. There are several ways to add a tooltip to a visualization, this challenge uses the SVG title element.
title pairs with the text() method to dynamically add data to the bars.
## Instructions
Append a title element under each rect node. Then call the text() method with a callback function so the text displays the data value.
## Tests
```yml
tests:
- text: Your code should have 9 title elements.
testString: assert($('title').length == 9);
- text: The first title element should have tooltip text of 12.
testString: assert($('title').eq(0).text() == '12');
- text: The second title element should have tooltip text of 31.
testString: assert($('title').eq(1).text() == '31');
- text: The third title element should have tooltip text of 22.
testString: assert($('title').eq(2).text() == '22');
- text: The fourth title element should have tooltip text of 17.
testString: assert($('title').eq(3).text() == '17');
- text: The fifth title element should have tooltip text of 25.
testString: assert($('title').eq(4).text() == '25');
- text: The sixth title element should have tooltip text of 18.
testString: assert($('title').eq(5).text() == '18');
- text: The seventh title element should have tooltip text of 29.
testString: assert($('title').eq(6).text() == '29');
- text: The eighth title element should have tooltip text of 14.
testString: assert($('title').eq(7).text() == '14');
- text: The ninth title element should have tooltip text of 9.
testString: assert($('title').eq(8).text() == '9');
```
## Challenge Seed
## Solution
```js
// solution required
```