<img-blob> custom element example

<img-blob alt="omg" src="lol.bin"></img-blob>

Modus operandi:

1. fetch() an encrypted image file;
2. read the key: rot13 the value of the X-Obfuscate header, then un-base64;
3. decrypt the file;
4. create a blob, then make a URL from it;
5. inject an <img> tag.

Supported attributes:

• alt
• src
• type (optional content type, like image/svg+xml)

Styling is done using ::part pseudo-element:

img-blob::part(image) { max-width: 100%; }