css/css-text/letter-spacing/letter-spacing-ligatures-003.html

<!DOCTYPE html>
<html  lang="en" >
<meta charset="utf-8">
<title>text-justify:inter-character and ligatures</title>
<link rel='author' title='Florian Rivoal' href='https://florian.rivoal.net'>
<link rel='help' href='https://drafts.csswg.org/css-text-3/#letter-spacing-property'>
<link rel='match' href='reference/letter-spacing-ligatures-003-ref.html'>
<meta name=flags content="should">
<meta name="assert" content="When the effective spacing between two characters is not zero (due to either justification […]), user agents should not apply optional ligatures, but they do need to apply mandatory ones.">
<style>
div {
    font-size: 2em;
    width: 12ch;
}
.test {
    text-align: justify;
    text-align-last: justify;
    text-justify: inter-character;
}
span { float: right; }
.ref { color: blue; }
</style>
<p>Test passes if the black text looks like the blue one.
<div lang=km class=test>&#x179F;&#x17B6;&#x17A0;&#x17B6;</div>
<div lang=km class=ref>&#x179F;&#x17B6;<span>&#x17A0;&#x17B6;</span></div>