# `react-doctor/remotion-no-css-url-assets`

CSS URL asset can flicker in Remotion

- **Category:** Bugs
- **Severity:** error
- **Source:** oxlint-plugin-react-doctor
- **Framework:** global
- **Enabled when:** remotion:4

## Validate the diagnostic

Confirm the reported code matches this rule before you edit it.

Confirm the reported code matches `react-doctor/remotion-no-css-url-assets`. Compare it with the Before example and verify the same API, framework, and execution context. Treat it as a false positive only when one of those conditions differs.

## Compare the code

The corrected pattern shows a focused way to address the diagnostic.

### Reported pattern

```tsx
import { AbsoluteFill, useCurrentFrame } from "remotion";

const Scene = () => {
  useCurrentFrame();
  return (
    <AbsoluteFill
      style={{
        backgroundImage: 'url("/hero.png")',
      }}
    />
  );
};
```

### Corrected pattern

```tsx
import {
  AbsoluteFill,
  Img,
  staticFile,
  useCurrentFrame,
} from "remotion";

const Scene = () => {
  useCurrentFrame();
  return (
    <AbsoluteFill>
      <Img
        src={staticFile("hero.png")}
        style={{ height: "100%", objectFit: "cover", width: "100%" }}
      />
    </AbsoluteFill>
  );
};
```

## How to fix

Use the corrected pattern as a reference. Preserve behavior that the rule does not require you to change.

### Copyable fix prompt

Copy this self-contained prompt into your coding agent after you confirm the diagnostic.

````text
Fix every confirmed `react-doctor/remotion-no-css-url-assets` diagnostic in the current repository.

Required change:
- Render the asset with `Img` inside an `AbsoluteFill`, or preload the same source with a hidden `Img` when a CSS mask is required.

Reference transformation:

Before:
```tsx
import { AbsoluteFill, useCurrentFrame } from "remotion";

const Scene = () => {
  useCurrentFrame();
  return (
    <AbsoluteFill
      style={{
        backgroundImage: 'url("/hero.png")',
      }}
    />
  );
};
```

After:
```tsx
import {
  AbsoluteFill,
  Img,
  staticFile,
  useCurrentFrame,
} from "remotion";

const Scene = () => {
  useCurrentFrame();
  return (
    <AbsoluteFill>
      <Img
        src={staticFile("hero.png")}
        style={{ height: "100%", objectFit: "cover", width: "100%" }}
      />
    </AbsoluteFill>
  );
};
```

Constraints:
- Confirm the reported code matches the Before pattern.
- Make the smallest change that fixes the root cause.
- Preserve behavior and interfaces unrelated to this diagnostic.
- Reuse existing project components, utilities, and conventions.
- Do not introduce render-phase side effects, render-phase state updates, or Hooks rule violations.
- Adapt identifiers and framework details instead of copying blindly.
- Do not disable the rule or suppress matching code.
- Confirm this rule is enabled for the project: `remotion:4`.

Verification:
- Run focused tests for the changed behavior.
- Run React Doctor and confirm this diagnostic no longer appears.
- Report the files changed and any checks you could not run.
````