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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 ## Description
<section id='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. 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. 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, which is also known as the range. 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: 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 ```js