Function makeURLAbsolute

makeURLAbsolute(
    tag: string,
    attr: string,
    hostname: string,
    html: string,
): string
Makes URLs absolute for a specific HTML tag and attribute.

Generic function that finds all instances of a given tag and converts a specific attribute from relative to absolute URLs.
Parameters
- tag: string
  The HTML tag name to target (e.g., 'img', 'a', 'link')
- attr: string
  The attribute name to convert (e.g., 'src', 'href')
- hostname: string
  The base hostname/URL for resolving relative paths
- html: string
  The HTML content to process
Returns string
HTML with the specified URLs converted to absolute
Example
```
// Convert video sources
makeURLAbsolute('video', 'src', 'https://example.com', html);

// Convert stylesheet links
makeURLAbsolute('link', 'href', 'https://example.com', html);
```
- Defined in readable.ts:165