默认不载入面积较大的 <iframe> 元素，减免一部分不必要的资源消耗。不是 lazyload；点击按钮（而不是点击 <iframe> 的任意位置）才会加载，以免误触。
// ==UserScript==
// @name <iframe> click to load
// @name:zh-CN 手动加载 <iframe>
// @description Reduce some unnecessary resource consumption by suspend the <iframe>s with larger area. NOT lazyload; click a button instead anywhere in the whole <iframe> element so one won't mis-click.
// @description:zh-CN 默认不载入面积较大的 <iframe> 元素，减免一部分不必要的资源消耗。不是 lazyload；点击按钮（而不是点击 <iframe> 的任意位置）才会加载，以免误触。
// @namespace RainSlide
// @author RainSlide
// @version 1.3
// @match *://*/*
// @exclude-match *://web.archive.org/web/*
// @exclude-match *://codepen.io/*
// @exclude-match *://music.163.com/*
// @exclude-match *://*.chaoxing.com/*
// @grant none
// @inject-into content
// @run-at document-end
// ==/UserScript==
"use strict";
document.querySelectorAll('iframe').forEach(
iframe => {
const src = iframe.getAttribute("src");
const srcdoc = iframe.getAttribute("srcdoc");
const width = iframe.clientWidth;
const height = iframe.clientHeight;
const srcURL =
src !== null &&
src !== "" && // less try ... catch
(() => {
try {
return new URL(src);
} catch (e) {
return false;
}
})();
// attribute
// src should be an vaild HTTP/HTTPS URL with a non-null origin,
// srcdoc attribute should not exist
srcURL instanceof URL &&
srcURL.origin !== "null" &&
/^https?:$/.test(srcURL.protocol) &&
srcdoc === null &&
// content size
// padding of <iframe> included
width >= 72 &&
height >= 72 &&
( width + height ) >= 256 &&
iframe.setAttribute("srcdoc",
`<style>${
`html, body {
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
html {
min-width: 5em;
min-height: 100%;
border: 2px dashed currentColor;
box-sizing: border-box;
}
a {
margin-bottom: 1ex;
word-break: break-all;
font-family: monospace;
}`.replace(/\n\t/g, " ").replace(/;\n\}/g, "; }")
}</style>
<a href="${ iframe.src }" target="_blank" rel="noreferrer noopener">${ iframe.src }</a>
<button onclick="window.frameElement.removeAttribute('srcdoc')">${
new Map([
["en-US", "Load"],
["zh-CN", "加载"],
["zh-TW", "加載"],
["zh-HK", "加載"]
]).get( navigator.language ) || "Load"
}</button>`
);
}
);