<p></p>
<p dir="auto">These days I think dropping support for IE11 is reasonable.</p>
<p dir="auto">On some of my projects, I use this snippet of code at the beginning of the <code>body</code> to show a warning from <a href="https://browser-update.org/" rel="nofollow">browser-update.org</a> (which I have reviewed and I trust) to tell users of old browsers that things might not work properly and they need to upgrade.  You can customize the messages or the browser versions.</p>
<div class="highlight highlight-text-html-basic"><pre><span class="pl-kos"><</span><span class="pl-ent">body</span><span class="pl-kos">></span>
<span class="pl-kos"><</span><span class="pl-ent">script</span><span class="pl-kos">></span><span class="pl-k">var</span> <span class="pl-s1">$buoop</span><span class="pl-c1">=</span><span class="pl-kos">{</span><span class="pl-c1">required</span>:<span class="pl-kos">{</span><span class="pl-c1">i</span>:<span class="pl-c1">15</span><span class="pl-kos">,</span><span class="pl-c1">e</span>:<span class="pl-c1">-</span><span class="pl-c1">4</span><span class="pl-kos">,</span><span class="pl-c1">f</span>:<span class="pl-c1">-</span><span class="pl-c1">3</span><span class="pl-kos">,</span><span class="pl-c1">o</span>:<span class="pl-c1">-</span><span class="pl-c1">3</span><span class="pl-kos">,</span><span class="pl-c1">s</span>:<span class="pl-c1">-</span><span class="pl-c1">1</span><span class="pl-kos">,</span><span class="pl-c1">c</span>:<span class="pl-c1">-</span><span class="pl-c1">3</span><span class="pl-kos">}</span><span class="pl-kos">,</span><span class="pl-c1">reminder</span>:<span class="pl-c1">0</span><span class="pl-kos">,</span><span class="pl-c1">noclose</span>:<span class="pl-c1">true</span><span class="pl-kos">,</span><span class="pl-c1">no_permanent_hide</span>:<span class="pl-c1">true</span><span class="pl-kos">,</span><span class="pl-c1">insecure</span>:<span class="pl-c1">true</span><span class="pl-kos">,</span><span class="pl-c1">api</span>:<span class="pl-c1">2021.06</span><span class="pl-kos">}</span><span class="pl-kos">;</span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>
<span class="pl-kos"><</span><span class="pl-ent">script</span> <span class="pl-c1">src</span>='<span class="pl-s">https://browser-update.org/update.js</span>'<span class="pl-kos">></span><span class="pl-kos"></</span><span class="pl-ent">script</span><span class="pl-kos">></span>
...</pre></div>

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