owo.json
,

"miao": {

"type": "picture",
"css": "miao",
"content": [
  {"file": "", "data": "::()"},
  {"file": "", "data": "::()"}
]

},

"meow": {

"type": "picture",
"css": "meow",
"content": [
  {"file": "", "data": "::"},
  {"file": "", "data": "::"}
]

}

js插入css样式，有效屏蔽显示在网页源代码，文件名伪装插入jsurl行，拆分css混淆加密放到别的js行，链接层套娃。
const style = document.createElement('style');
style.textContent = `

`;
document.head.appendChild(style);

const style = new CSSStyleSheet();
style.replaceSync(`

`);
document.adoptedStyleSheets = [...document.adoptedStyleSheets, style];