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HTML

              
                <!-- For sloppy testing: Add os_iOS or os_Android to <main> -->

<!-- Better to use a real device though -->

<main class=os_iOS-or-os_Android>

  <h1>Hide an unsupported OS download button on mobile</h1>

  <section class=btns_cnt-downloads>

    <a class=dwnld_lnk-apple href>
      <svg class=dwnld_img-apple aria-label="Apple app: Download from the App Store"><use xlink:href="#btn_appStore"></use></svg>
    </a>

    <a class=dwnld_lnk-android href>
      <svg class=dwnld_img-google aria-label="Android app: Get it on Google Play"><use xlink:href="#btn_googlePlay"></use></svg>
    </a>

  </section>

  <p>Detection script adds <code>.os_iOS</code> or <code>.os_Android</code> to the <code>html</code> element.<br>
    Buttons below fake that detection purely for visualisation purposes:
  </p>
  
  <section class=btns_cnt-fakes>
    <button class=fake_btn-os_iOS>Fake iOS</button>
    <button class=fake_btn-os_Android>Fake Android</button>
  </section>

</main>

<svg class=visually-hidden id=buttons-appStore-googlePlay>
  <defs>

    <symbol id="btn_appStore" width="135" height="40" fill="#FFF" viewBox="0 0 135 40">

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    </symbol>

    <symbol id="btn_googlePlay" viewBox="0 0 135 40">

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    </symbol>

  </defs>
</svg>


[[[https://codepen.io/2kool2/pen/mKeeGM]]]
              
            
!

CSS

              
                :root {
  --columns: 1fr;
  --gap: 1.5rem;
}
@media (min-width: 20em) {
  :root {
    --columns: 1fr 1fr;
    --gap: 1rem;
  }
}
*,
::before,
::after {
  box-sizing: inherit;
}
body {
  font-family: sans-serif;
  line-height: 1.5;
  margin: 1rem;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: hsl(269,19%,30%);
  background-color: hsla(32,100%,85%,.35);
  background-image: url("data:image/svg+xml;charset=utf8,%3Csvg width='100%25' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cfilter id='a'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.4'/%3E%3C/filter%3E%3C/defs%3E%3C!-- %3Cpath filter='url(%23a)' opacity='.3' d='M0 0h1200v256H0z'/%3E--%3E%3Crect filter='url(%23a)' opacity='.3' width='100%25' height='100%25'/%3E%3C/svg%3E");
}
h1 {
  font-weight: 100;
  line-height: 1.3;
  text-align: center;
  margin-bottom: .5rem;
}
p {
  text-align: center;
  margin: 1rem 0 .5rem;
}
code {
  font-size: 16px;
  text-shadow: 1px 1px #fff;
}
.visually-hidden {
  position: absolute !important;
  height: 1px;
  width: 1px; 
  overflow: hidden;
  clip: rect(1px, 1px, 1px, 1px);
}

[class^="btns_cnt"] {
  display: grid;
  grid-gap: var(--gap);
  grid-template-columns: var(--columns);
  justify-content: center;
  max-width: 330px;
  margin: 0 auto;
  padding: 1rem 0;
}
[class^="dwnld_lnk"] {
  background-color: #000;
  border-radius: 4px;
  box-shadow: 0 .25em .25em rgba(0,0,0,.3);
  transition: all 0.3s ease-out;
  display: block;
  margin: 0 auto;
  text-decoration: none;
}
[class^="dwnld_lnk"]:hover,
[class^="dwnld_lnk"]:focus {
  transform: scale(1.1);
  box-shadow: 0 .35em .35em rgba(0,0,0,.4);
}
[class^="dwnld_img"] {
  display: block;
  margin: 0 auto;
  width: 135px;
  height: 40px;
}


/* Hide unsupported button */
:root[class^="os_"] .btns_cnt-downloads {
  --columns: 1fr;
  --gap: 1rem;
}
.os_Android .dwnld_lnk-apple,
.os_iOS .dwnld_lnk-android {
  display: none;
}


/* Faking the OS buttons */

[class^="fake_btn"] {
  font: inherit;
  color: #503660;
  background-color: #fff;
  min-width: 98px;
  border: 2px solid hsl(269,19%,30%);
  padding: .5rem 1rem .25rem;
  border-radius: 4px;
  transition: all 0.3s ease-out;
  display: block;
  margin: 0 auto;
  text-decoration: none;
  box-shadow: 0 .25em .25em rgba(0,0,0,.3);
}
[class^="fake_btn"]:hover,
[class^="fake_btn"]:focus {
  color: #418cec;
  border-color: #418cec;
  box-shadow: 0 .5em .5em rgba(0,0,0,.4);
}

.os_iOS .fake_btn-os_iOS,
.os_Android .fake_btn-os_Android {
  background-color: lightgreen;
}

              
            
!

JS

              
                // Uses device detection to add a class to <html> but only if an Android or Apple mobile.
// Purposefully ES5
// Based on: https://stackoverflow.com/questions/21741841/detecting-ios-android-operating-system

var detect_OS_set_HTML_class = (function() {
  
  "use strict";

  var html = document.documentElement;
  var userAgent = navigator.userAgent || navigator.vendor || window.opera;

  // Windows Phone must come first because its UA also contains "Android"

  if (/windows phone/i.test(userAgent)) {
    // html.className += " os_Windows";
    return "Windows";
  }

  if (/android/i.test(userAgent)) {
    html.className += " os_Android";
    return "Android";
  }

  // iOS detection from: http://stackoverflow.com/a/9039885/177710

  if (/iPad|iPhone|iPod/.test(userAgent) && !window.MSStream) {
    html.className += " os_iOS";
    return "iOS";
  }

  return "Unknown";

})();




/* Faking-up the OS buttons
   Buttons add .os_iOS or .os_Android to <html> */

const fake_OS_detection_set_HTML_class_from_button = (function() {

  "use strict";

  const class_iOS = "os_iOS";
  const class_Android = "os_Android";
  const html = document.documentElement;
  const buttons = document.querySelectorAll("[class*=fake_btn]");

  if (!buttons) return false;

  const resetHTMLClass = () => {
    html.classList.remove(class_iOS, class_Android);
  };
  
  const setHTMLClass = (btn, clss, is_os) => {
    if (btn.className.match(clss)) {
      if (!is_os) {
        html.classList.add(clss);
      }
    }
  };

  const fakeBtnClick = (event) => {
    const btn = event.target;
    const is_iOS = html.classList.contains(class_iOS);
    const is_Android = html.classList.contains(class_Android);
    resetHTMLClass();
    setHTMLClass(btn, class_iOS, is_iOS);
    setHTMLClass(btn, class_Android, is_Android);
  };

  for (let btn of buttons) {
    btn.addEventListener("click", fakeBtnClick);
  }
})();
              
            
!
999px

Console