STR: Put some texts which include the sequence of joined typographic letter units of cursive scripts such as Arabic, ex. مممممع in a web page. Apply letter-spacing property. Expect: The sequence مممممع should has no gaps in it Actual: The sequence مممممع has gaps in it I've uploaded a test file (see attached) which refers to CSSWG's text-justify test . According to the CSS Text 3 letter-spacing specification , ``` if the UA cannot expand text from a cursive script without breaking its cursive connections, it must not apply spacing between any pair of that script’s typographic letter units at all. ``` A similar description can be found in text-justify  as well, ``` Justification must not introduce gaps between the joined typographic letter units of cursive scripts such as Arabic ``` It seems both of them specify that we should not introduce any gaps in these cursive scripts at all.  https://www.w3.org/International/tests/repo/run?base=css-text-3&batch=text-align&test=text-justify/text-justify-004.html  https://drafts.csswg.org/css-text-3/#cursive-tracking  https://drafts.csswg.org/css-text-3/#justify-cursive
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