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fontdetect.html
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fontdetect.html
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<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
<script type="text/javascript">
(function () {
const context = document.createElement("canvas").getContext("2d");
context.font = "200px SANS-SERIF"
const TEXT_TO_MEASURE = "A";
var FONT_WIDTH = context.measureText(TEXT_TO_MEASURE).width;
(function () {
var style = document.createElement("style");
style.setAttribute("type", "text/css");
style.textContent = `@font-face{font-family:'__DEFAULT_FONT__';src:url('data:application/font-woff;base64,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');}`;
document.documentElement.appendChild(style);
var handleId = null;
(function initailizeDefaultFont() {
context.font = "200px __DEFAULT_FONT__";
var width = context.measureText(TEXT_TO_MEASURE).width;
if (width != FONT_WIDTH) {
FONT_WIDTH = width;
cancelAnimationFrame(handleId);
}
else if (handleId == null) {
handleId = requestAnimationFrame(initailizeDefaultFont);
}
})();
})();
function checkFontAvailable(font) {
if (/^\s*SANS-SERIF\s*$/i.test(font)) {
return true;
}
if (!font || font == '__DEFAULT_FONT__') {
return false;
}
context.font = `200px ${font.replace(/^\s*['"]|['"]\s*$/g, "")}, __DEFAULT_FONT__`;
var width = context.measureText(TEXT_TO_MEASURE).width;
return width != FONT_WIDTH;
}
this.checkFontAvailable = checkFontAvailable;
}).apply(this);
console.log([checkFontAvailable("arial black b"), checkFontAvailable("arial black")]);
</script>
</head>
<body>
</body>
</html>