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Update README.md . #877

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12 changes: 9 additions & 3 deletions README.md
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Expand Up @@ -300,16 +300,22 @@ lazysizes adds the class ``lazyloading`` while the images are loading and the cl

In case you are using an `alt` attribute but do not declare a `src`/`srcset` attribute you will end up with a broken image symbol.

There are two easy ways to deal with it.
There are easy ways to deal with it.

Either define a `src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="` or add the following CSS.

```css
img.lazyload:not([src]) {
img.lazyloaded:not([src]) {
visibility: hidden;
}
```

```css
img.lazyloaded:not([src]) {
background-size: cover;
background-image: url("default.png");
background-color: lightskyblue;
}
```

### JS API
**lazysizes** automatically detects new elements with the class ``lazyload`` so you won't need to call or configure anything in most situations.
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