94 lines
2.5 KiB
Markdown
94 lines
2.5 KiB
Markdown
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---
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id: 587d7fa8367417b2b2512bcb
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title: Learn About SVG in D3
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challengeType: 6
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forumTopicId: 301489
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dashedName: learn-about-svg-in-d3
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---
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# --description--
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<dfn>SVG</dfn> stands for <dfn>Scalable Vector Graphics</dfn>.
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Here "scalable" means that, if you zoom in or out on an object, it would not appear pixelated. It scales with the display system, whether it's on a small mobile screen or a large TV monitor.
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SVG is used to make common geometric shapes. Since D3 maps data into a visual representation, it uses SVG to create the shapes for the visualization. SVG shapes for a web page must go within an HTML `svg` tag.
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CSS can be scalable when styles use relative units (such as `vh`, `vw`, or percentages), but using SVG is more flexible to build data visualizations.
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# --instructions--
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Add an `svg` node to the `body` using `append()`. Give it a `width` attribute set to the provided `w` constant and a `height` attribute set to the provided `h` constant using the `attr()` or `style()` methods for each. You'll see it in the output because there's a `background-color` of pink applied to it in the `style` tag.
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**Note:** When using `attr()` width and height attributes do not have units. This is the building block of scaling - the element will always have a 5:1 width to height ratio, no matter what the zoom level is.
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# --hints--
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Your document should have 1 `svg` element.
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```js
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assert($('svg').length == 1);
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```
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The `svg` element should have a `width` attribute set to `500` or styled to have a width of `500px`.
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```js
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assert($('svg').attr('width') == '500' || $('svg').css('width') == '500px');
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```
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The `svg` element should have a `height` attribute set to `100` or styled to have a height of `100px`.
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```js
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assert($('svg').attr('height') == '100' || $('svg').css('height') == '100px');
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```
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# --seed--
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## --seed-contents--
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```html
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<style>
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svg {
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background-color: pink;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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// Add your code below this line
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// Add your code above this line
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</script>
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</body>
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```
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# --solutions--
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```html
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<style>
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svg {
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background-color: pink;
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}
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</style>
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<body>
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<script>
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const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
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const w = 500;
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const h = 100;
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const svg = d3.select("body")
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.append("svg")
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.attr("width", w)
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.attr("height", h)
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</script>
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</body>
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```
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