word-spacing-inline-box-line-width.html

<!DOCTYPE html>
<style>
#container {
    width: 300px;
    height: 300px;
    border: solid 1px red;
    text-align: end;
    word-spacing: 10px;
}
</style>
<div id="container">
    <span>AAAAA</span>
    <span style="display:inline-block">BBBBB</span>
    <span>CCCCC</span>
</div>
This test passes if the texts are aligned right, without overflowing.

chromium/third_party/blink/web_tests/fast/css/word-spacing-inline-box-line-width.html