// ==UserScript==
// @name         CSS rules utilities
// @namespace    http://tampermonkey.net/
// @version      0.4
// @description  functions allowing to get the CSS rules applied to an element
// @author       CoStiC
// @match        *://*/*
// @grant        none
// ==/UserScript==
function findCssRules(el) {
var sheets = document.styleSheets, ret = [];
el.matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector || el.oMatchesSelector;
for (var i in sheets) {
var rules = sheets[i].rules || sheets[i].cssRules;
for (var r in rules) {
if (el.matches(rules[r].selectorText)) {
ret.push(rules[r].cssText);
}
}
}
return ret;
}
function modCssRules(el, newRule, frDoc) {
if (!frDoc || (frDoc === window)) frDoc = window.document;
let elHover = "",
sheets = frDoc.styleSheets;
if (el !== null) {
el.matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector || el.oMatchesSelector;
for (let sheet of sheets) {
var rules = sheet.rules || sheet.cssRules;
for (let rule of rules) {
if (rule.type === 1) {
if (el.matches(rule.selectorText)) {
for (let newProp in newRule.cssNormal) {
rule.style[newProp] = newRule.cssNormal[newProp];
}
if (typeof newRule.cssHover !== 'undefined') {
var rul = "";
for (let propHover in newRule.cssHover) {
rul += `${propHover}:${newRule.cssHover[propHover]} !important;`;
};
elHover = `${rules[rule].selectorText}:hover{${rul}}`;
}
} else {};
}
}
}
}
if (elHover !== "") {
let newHoverStyle = document.createElement('style'),
hoverRule = document.createTextNode(elHover);
newHoverStyle.appendChild(hoverRule);
document.head.appendChild(newHoverStyle)
//sheets[sheets.length - 1].insertRule(elHover);
};
}