mirror of https://gitlab.com/curben/blog
75 lines
2.7 KiB
Markdown
75 lines
2.7 KiB
Markdown
---
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title: Embed SVG without using img tag
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excerpt: Using img tag prevents the use of CSS to change property of SVG. There is a workaround.
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date: 2019-06-01
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tags:
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- svg
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- web
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---
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Website usually embed SVG using `<img>` tag or directly use the `<svg>` tag. Using `<img>` tag prevents the use of CSS to change property of SVG. As for inline `<svg>`, I prefer to have a separate file that is easier to keep track.
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## Embed SVG file
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Utilise `<use>` tag to embed an SVG file in `svg`. For example in this blog, I have a search button on the top right corner. This is how I embed the [search.svg](/svg/search.svg):
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```html
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<svg viewBox="0 0 512 512">
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<title>Search</title>
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<desc>Search icon</desc>
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<use href="/svg/search.svg#search"/>
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</svg>
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```
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<br/>
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The `<title>` is for tooltip and `<desc>` stands for description and functions similarly to the `alt` attribute in `<img>`. These two tags are optional but recommended for [SEO purpose](https://support.google.com/webmasters/answer/114016?hl=en).
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The `viewBox` value is based on the layout you want to use. I simply use the value from the SVG file.
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Notice `#search` value in the href attribute. It refers to the `id` attribute in the SVG file, which you need to manually add it. Following is an excerpt from the search.svg.
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```
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<svg id="search" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="..."/></svg>
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```
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That attribute is **mandatory**; using link alone like `<use href="/svg/search.svg"/>` would *not* work. Another thing to watch out is SVG minifier like [svgo](https://github.com/svg/svgo) (the only SVG minifier?). **svgo** removes the id attribute by default, via [cleanupIDs](https://github.com/svg/svgo/blob/master/plugins/cleanupIDs.js) plugin.
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To disable that plugin in CLI,
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```
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svgo --disable=cleanupIDs test.svg -o test.min.svg
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```
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<br/>
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For [hexo-yam](https://github.com/weyusi/hexo-yam),
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```json
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neat_svg:
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plugins: [{ cleanupIDs: false }]
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```
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## img tag
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Currently, I use the following CSS,
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```css
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svg {
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fill: currentColor;
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}
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```
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to set the SVG to use the same colour as the font's. The `fill` attribute is not supported in `<img>` tag. Since `<image>` property in SVG is [defined as a synonym](https://developer.mozilla.org/en-US/docs/Web/SVG/Element/image) for `<img>`, it also shares similar limitation. So, the following method *would not* work,
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```html
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<svg viewBox="0 0 512 512">
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<title>Search</title>
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<desc>Search icon</desc>
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<image href="/svg/search.svg" x="0" y="0" height="512" width="512"/>
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</svg>
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```
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## object tag
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`<object>` [tag](https://css-tricks.com/using-svg/#article-header-id-11) doesn't work inside an `<a>` tag.
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Source: [CSS-Tricks.com](https://css-tricks.com/svg-use-external-source/) |