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guardrex merged 2 commits into from
Jul 12, 2021
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Blazor SVG #22717

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Blazor SVG
guardrex Jul 12, 2021
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guardrex Jul 12, 2021
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46 changes: 44 additions & 2 deletions aspnetcore/blazor/components/index.md
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Expand Up @@ -1274,7 +1274,7 @@ For information on setting an app's base path, see <xref:blazor/host-and-deploy/

## Scalable Vector Graphics (SVG) images

Since Blazor renders HTML, browser-supported images, including Scalable Vector Graphics (SVG) images (`.svg`), are supported via the `<img>` tag:
Since Blazor renders HTML, browser-supported images, including [Scalable Vector Graphics (SVG) images (`.svg`)](https://developer.mozilla.org/docs/Web/SVG), are supported via the `<img>` tag:

```html
<img alt="Example image" src="image.svg" />
Expand All @@ -1288,7 +1288,49 @@ Similarly, SVG images are supported in the CSS rules of a stylesheet file (`.css
}
```

However, inline SVG markup isn't supported in all scenarios. If you place an `<svg>` tag directly into a Razor file (`.razor`), basic image rendering is supported but many advanced scenarios aren't yet supported. For example, `<use>` tags aren't currently respected, and [`@bind`][10] can't be used with some SVG tags. For more information, see [SVG support in Blazor (dotnet/aspnetcore #18271)](https://github.com/dotnet/aspnetcore/issues/18271).
::: moniker range=">= aspnetcore-6.0"

Blazor supports the [`<foreignObject>`](https://developer.mozilla.org/docs/Web/SVG/Element/foreignObject) element to display arbitrary HTML within an SVG. The markup can represent arbitrary HTML, a <xref:Microsoft.AspNetCore.Components.RenderFragment>, or a Razor component.

The following example demonstrates:

* Display of a `string` (`@message`).
* Two-way binding with an `<input>` element and a `value` field.
* A `Robot` component.

```razor
<svg width="200" height="200" xmlns="http://www.w3.org/2000/svg">
<rect x="0" y="0" rx="10" ry="10" width="200" height="200" stroke="black"
fill="none" />
<foreignObject x="20" y="20" width="160" height="160">
<p>@message</p>
</foreignObject>
</svg>

<svg xmlns="http://www.w3.org/2000/svg">
<foreignObject width="200" height="200">
<label>
Two-way binding:
<input @bind="value" @bind:event="oninput" />
</label>
</foreignObject>
</svg>

<svg xmlns="http://www.w3.org/2000/svg">
<foreignObject>
<Robot />
</foreignObject>
</svg>

@code {
private string message = "Lorem ipsum dolor sit amet, consectetur adipiscing " +
"elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.";

private string value;
}
```

::: moniker-end

## Whitespace rendering behavior

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