It seems like you encountered an issue with the blob URL. Let me ensure this version properly handles the file conversion, downloads, and enhances error handling.
Here's an improved version that ensures correct conversion and handles common issues:
```html
WebP to JPG/PNG Converter
WebP to JPG/PNG Converter
Drag & drop a WebP file here or click to select
```
In this version, we:
1. Ensured proper error messages if the user has not selected a file.
2. Used event listeners to highlight the drop area appropriately.
3. Employed FileReader API directly for better handling of the image conversion.
4. Provided clear feedback in case of issues and smoother user interaction.