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<!DOCTYPE html>
< html >
< head >
< title > TextMetrics test< / title >
< meta http-equiv = "content-type" content = "text/html; charset=UTF-8" >
< link href = "testIcon.svg" type = "image/png" rel = "icon" >
< link href = "testIcon.svg" type = "image/png" rel = "shortcut icon" >
< style >
.hash {
font-family: monospace;
}
< / style >
< / head >
< body >
< h1 > TextMetrics test< / h1 >
< h2 > Expected result< / h2 >
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< ol >
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< li > the hashes are different to the hashes when CanvasBlocker is disabled< / li >
< li > the number of differences stays the same when CanvasBlocker is disabled< / li >
< li > if "refresh" is clicked nothing must change< / li >
< li > upon page reload the hashes change (depending on CanvasBlocker settings - e.g. not in the stealth preset)< / li >
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< li > Firefox 68 does only offer integer precision in TextMetrics and therefore less fingerprinting potential. CanvasBlocker only changes values if they are no integer and therefore point 1 and 4 are not true in Firefox 68.< / li >
< / ol >
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< h2 > Tests< / h2 >
< div id = "tests" >
< div class = "test" id = "measureText" >
< h3 class = "title" > measureText< / h3 >
Hashes: < span class = "hashes" > < table >
< tr >
< td > all:< / td >
< td class = "hash all" > < / td >
< / tr >
< / table > < / span > < br >
Number of differences: < span class = "differences" > < / span > < br >
< button class = "refresh" > refresh< / button >
< / div >
< / div >
< script src = "testAPI.js" > < / script >
< script src = "textMetricsTest.js" > < / script >
< / body >
< / html >
