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Use style sheet, remove URL rewriting #58

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Jun 29, 2020
Merged

Use style sheet, remove URL rewriting #58

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34 changes: 11 additions & 23 deletions ie11CustomProperties.js
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Original file line number Diff line number Diff line change
Expand Up @@ -113,28 +113,25 @@
//const regHasVar = /var\(/;
var regPseudos = /:(hover|active|focus|target|visited|link|:before|:after|:first-letter|:first-line)/;

onElement('link[rel="stylesheet"]', function (el) {
fetchCss(el.href, function (css) {
var newCss = rewriteCss(css);
if (css === newCss) return;
newCss = relToAbs(el.href, newCss);
el.disabled = true;
var style = document.createElement('style');
if (el.media) style.setAttribute('media', el.media);
el.parentNode.insertBefore(style, el);
activateStyleElement(style, newCss);
});
});

function foundStyle(el){
if (el.ieCP_polyfilled) return;
if (el.ieCP_elementSheet) return;
if (!el.sheet) return;
if (el.href) {
return fetchCss(el.href, function (css) {
var newCss = rewriteCss(css);
if (css === newCss) return;
activateStyleElement(el, newCss);
});
}

var css = el.innerHTML;
var newCss = rewriteCss(css);
if (css === newCss) return;
activateStyleElement(el, newCss);
}
onElement('style', foundStyle);
onElement('link[rel="stylesheet"]', foundStyle);
// immediate, to pass w3c-tests, bud its a bad idea
// addEventListener('DOMNodeInserted',function(e){ e.target.tagName === 'STYLE' && foundStyle(e.target); });

Expand All @@ -148,15 +145,6 @@
if (found.setters) addSetterElement(el, found.setters);
});

function relToAbs(base, css) {
return css.replace(/url\(([^)]+)\)/g, function($0, $1){
$1 = $1.trim().replace(/(^['"]|['"]$)/g,'');
if ($1.match(/^([a-z]+:|\/)/)) return $0;
base = base.replace(/\?.*/,'');
return 'url('+ base + './../' + $1 +')';
});
}

// ie has a bug, where unknown properties at pseudo-selectors are computed at the element
// #el::after { -content:'x'; } => getComputedStyle(el)['-content'] == 'x'
// should we add something like -ieVar-pseudo_after-content:'x'?
Expand Down Expand Up @@ -229,7 +217,7 @@
return {getters:getters, setters:setters};
}
function activateStyleElement(style, css) {
style.innerHTML = css;
style.sheet.cssText = css;
style.ieCP_polyfilled = true;
var rules = style.sheet.rules, i=0, rule; // cssRules = CSSRuleList, rules = MSCSSRuleList
while (rule = rules[i++]) {
Expand Down