title: Is it possible to use a language for which no system font exists in title-attribute tooltips?
body: <p>I'm developing a website that needs to be able to display LTR and RTL scripts, among the latter also <a href="https://en.wikipedia.org/wiki/Syriac_language" rel="nofollow noreferrer">Syriac</a>, which is not supported by all systems out of the box. So, for Syriac I'm using webfonts, which work fine for "normal" text (i.e. headings, paragraphs, and so on).</p>
  
  <p>One part of the site is implemented using a <a href="https://github.com/Mottie/Keyboard/" rel="nofollow noreferrer">virtual keyboard</a> written in JavaScript, which has explanations for what certain keys do in the HTML <code>title</code> attribute. The tooltips rendered by the browser for these <code>title</code> attributes look like this at the moment:</p>
  
  <p><img src="https://i.imgur.com/YR4lfa9.png" alt="Screenshot of broken tooltip"></p>
  
  <p>My question is: is there any way (without having to change all the browers' sourcecode and without having to add extra HTML via JavaScript) to have the Syriac webfont be used for those <code>title</code>-attribute-based tooltips?</p>
  
  <p>Edit: I'm asking this question specifically to find out if it's possible to make the Syriac writing visible. I'm aware that this <em>might</em> be the same problem as trying to style the tooltip in some way. But I'm hoping I'm wrong and somebody knows some solution.</p>