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Update README.md 

more in-depth documentation of slide backgrounds #1542
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Hakim El Hattab 2016-05-23 11:59:29 +02:00
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@ -510,26 +510,58 @@ Reveal.addEventListener( 'somestate', function() {
### Slide Backgrounds
Slides are contained within a limited portion of the screen by default to allow them to fit any display and scale uniformly. You can apply full page backgrounds outside of the slide area by adding a ```data-background``` attribute to your ```<section>``` elements. Four different types of backgrounds are supported: color, image, video and iframe. Below are a few examples.
Slides are contained within a limited portion of the screen by default to allow them to fit any display and scale uniformly. You can apply full page backgrounds outside of the slide area by adding a ```data-background``` attribute to your ```<section>``` elements. Four different types of backgrounds are supported: color, image, video and iframe.
##### Color Backgrounds
All CSS color formats are supported, like rgba() or hsl().
```html
<section data-background="#ff0000">
<h2>All CSS color formats are supported, like rgba() or hsl().</h2>
</section>
<section data-background="http://example.com/image.png">
<h2>This slide will have a full-size background image.</h2>
</section>
<section data-background="http://example.com/image.png" data-background-size="100px" data-background-repeat="repeat">
<h2>This background image will be sized to 100px and repeated.</h2>
</section>
<section data-background-video="https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.mp4,https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.webm" data-background-video-loop data-background-video-muted>
<h2>Video. Multiple sources can be defined using a comma separated list. Video will loop when the data-background-video-loop attribute is provided and can be muted with the data-background-video-muted attribute.</h2>
</section>
<section data-background-iframe="https://slides.com">
<h2>Embeds a web page as a background. Note that the page won't be interactive.</h2>
<section data-background-color="#ff0000">
<h2>Color</h2>
</section>
```
##### Image Backgrounds
By default, background images are resized to cover the full page. Available options:
| Attribute | Default | Description |
| :--------------------------- | :--------- | :---------- |
| data-background-image | | URL of the image to show. GIFs restart when the slide opens. |
| data-background-size | cover | See [background-size](https://developer.mozilla.org/docs/Web/CSS/background-size) on MDN. |
| data-background-position | center | See [background-position](https://developer.mozilla.org/docs/Web/CSS/background-position) on MDN. |
| data-background-repeat | no-repeat | See [background-repeat](https://developer.mozilla.org/docs/Web/CSS/background-repeat) on MDN. |
```html
<section data-background-image="http://example.com/image.png">
<h2>Image</h2>
</section>
<section data-background-image="http://example.com/image.png" data-background-size="100px" data-background-repeat="repeat">
<h2>This background image will be sized to 100px and repeated</h2>
</section>
```
##### Video Backgrounds
Automatically plays a full size video behind the slide.
| Attribute | Default | Description |
| :--------------------------- | :------ | :---------- |
| data-background-video | | A single video source, or a comma separated list of video sources. |
| data-background-video-loop | false | Flags if the video should play repeatedly. |
| data-background-video-muted | false | Flags if the audio should be muted. |
```html
<section data-background-video="https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.mp4,https://s3.amazonaws.com/static.slid.es/site/homepage/v1/homepage-video-editor.webm" data-background-video-loop data-background-video-muted>
<h2>Video</h2>
</section>
```
##### Iframe Backgrounds
Embeds a web page as a background. Note that since the iframe is in the background layer, behind your slides, it is not possible to interact with the embedded page.
```html
<section data-background-iframe="https://slides.com">
<h2>Iframe</h2>
</section>
```
##### Background Transitions
Backgrounds transition using a fade animation by default. This can be changed to a linear sliding transition by passing ```backgroundTransition: 'slide'``` to the ```Reveal.initialize()``` call. Alternatively you can set ```data-background-transition``` on any section with a background to override that specific transition.