Copy URL UserScript

copy-url.user.js

// ==UserScript==
// @include    *
// @noframes
// @grant      unsafeWindow
// @grant      GM_registerMenuCommand
// @grant      GM_setClipboard
// ==/UserScript==

GM_registerMenuCommand('Copy URL', () => {

    let url = window.location.href;

    let selectionBound;
    let selection = document.getSelection();
    for(let node = !selection.isCollapsed && selection.anchorNode; node; node = node.parentNode) {
        if (node.getBoundingClientRect) {
            selectionBound = node.getBoundingClientRect();
            break;
        }
    }

    if (selectionBound) {
        var tags = [];
        for (let element of document.querySelectorAll('[id]')) {
            if (element.id) {
                let bound = element.getBoundingClientRect();
                if (bound.left < selectionBound.right && bound.right > selectionBound.left) {
                    let diff = selectionBound.top - bound.top;
                    if (diff >= 0 && diff < 1000) {
                        tags.push({id: element.id, diff});
                    }
                }
            }
        }
        if (tags.length) {
            tags.sort((a, b) => (a.diff - b.diff) || (a.id.length - b.id.length));
            url = url.split('#')[0] + '#' + tags[0].id;
        }
    }

    url = decodeURIComponent(url).replace(/%20/g,'%2520')
    GM_setClipboard(url);
}, 'c');