Add <dfn> tags (#39260)
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## Description
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<section id='description'>
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By default, scales use the identity relationship - the input value maps to the output value. But scales can be much more flexible and interesting.
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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.
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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.
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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>.
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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>.
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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:
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```js
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