<p dir="auto">There was a fix made in 2.2.2 to address 0 font size for popovers within a btn group:</p>
<p dir="auto"><a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="8447581" data-permission-text="Title is private" data-url="https://github.com/twbs/bootstrap/issues/5939" data-hovercard-type="issue" data-hovercard-url="/twbs/bootstrap/issues/5939/hovercard" href="https://github.com/twbs/bootstrap/issues/5939">#5939</a></p>
<p dir="auto">I don't think the fix was comprehensive as it still happens in other situations. Here's an example within an input-append form element:</p>
<p dir="auto"><a href="http://jsfiddle.net/YUS87/" rel="nofollow">http://jsfiddle.net/YUS87/</a></p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="&lt;div class=&quot;btn-group&quot;&gt;
    &lt;a class=&quot;btn&quot; rel=&quot;popover&quot; data-content=&quot;Lorem ipsum dolor sit amet.&quot;&gt;Click me!&lt;/a&gt;
&lt;/div&gt;"><pre lang="ħtml" class="notranslate"><code class="notranslate">&lt;div class="btn-group"&gt;
    &lt;a class="btn" rel="popover" data-content="Lorem ipsum dolor sit amet."&gt;Click me!&lt;/a&gt;
&lt;/div&gt;
</code></pre></div>
<p dir="auto">Clicking the button results in a blank popover appearing. Am I doing something wrong or is this an issue? If so, is there any workaround in the meantime?</p>
<p dir="auto">Thanks in advance.</p>