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Why can't I change ```font-feature-settings``` directly with javascript?

I want to make a simple web page to test OpenType features.

What I want: I simply enter some text and the feature I want to use in inputboxes, and click a button to change the content and style of a div.

However I found that the font-feature-settings wouldn't change as I expect. For example,

<html>

<body>
  <input id="feature" /><input type="button" value="Change Feature" onclick="
    alert(document.getElementById('feature').value);
    document.getElementById('display').style.fontFeatureSettings=document.getElementById('feature').value;
    alert(document.getElementById('display').style.fontFeatureSettings);" />
  <div id="display" style="font-size:72;">Some text</div>
</body>

</html>

In my Chrome, the first message box shows what I inputed, yet the second message box is always empty.

I end up defining a lot of CSS classes and changing them with javascript. It works now, but it doesn't meet my need, for I have to predefine a lot of features and thus have difficulty in extending it for future use.

about 4 years ago · Juan Pablo Isaza

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Why can't I change ```font-feature-settings``` directly with javascript?

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