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Add <dfn> tags (#39260)

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Ty Mick
2020-07-16 14:35:03 -04:00
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curriculum/challenges/english/04-data-visualization/data-visualization-with-d3/set-a-domain-and-a-range-on-a-scale.english.md
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@ -9,8 +9,8 @@ forumTopicId: 301491
## Description
<section id='description'>
By default, scales use the identity relationship - the input value maps to the output value. But scales can be much more flexible and interesting.
Say a data set has values ranging from 50 to 480. This is the input information for a scale, and is also known as the domain.
You want to map those points along the <code>x</code> axis on the SVG canvas, between 10 units and 500 units. This is the output information, which is also known as the range.
Say a data set has values ranging from 50 to 480. This is the input information for a scale, also known as the <dfn>domain</dfn>.
You want to map those points along the <code>x</code> axis on the SVG canvas, between 10 units and 500 units. This is the output information, also known as the <dfn>range</dfn>.
The <code>domain()</code> and <code>range()</code> methods set these values for the scale. Both methods take an array of at least two elements as an argument. Here's an example:
```js