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<nav id=menu_container class=menu_container>
  <ul id=menu class=menu>
    <li><a class=menu_lnk-1 href="">Articles</a></li>
    <li><a class=menu_lnk-2 href="">Tools</a></li>
    <li><a class=menu_lnk-3 href="">CodePens</a></li>
    <li><a class=menu_lnk-4 href="">Portfolio</a></li>
  </ul>
</nav>


<section style="margin:1rem">
  <p>Removed the initial transform transition and replaced with a filter transition.<br>Much more consistant cross-browser.<br>Border looks better in black and thicker now too.</p>
</section>


<section>

  <label>Border width: <input id="rangeBorder" type="range" min="0" max="5" value="1"/></label>
  <!-- <label>Blur width: <input id="rangeBlur" type="range" min="0" max="5" value="2"/></label> -->

  <script>
    /* Just for the sliders */

    var rangeBorder = document.getElementById("rangeBorder");
    rangeBorder.addEventListener("change", function () {
      document.getElementById("menu").className = "menu border" + this.value;
    }, false);

    var rangeBlur = document.getElementById("rangeBlur");
    rangeBlur.addEventListener("change", function () {
      document.getElementById("menu_container").className = "menu_container blur" + this.value;
    }, false);
  </script>

</section>
<!--
<footer>
  <div class="menu_container-footer">
    <ul class="menu">
      <li><a class=menu_lnk-1 href="">Contact</a></li>
      <li><a class=menu_lnk-3 href="">Site-map</a></li>
      <li><a class=menu_lnk-4 href="">Accessibility</a></li>
      <li><a class=menu_lnk-2 href="">Privacy</a></li>
      <li><a class=menu_lnk-1 href="">T&amp;Cs</a></li>
    </ul>
  </div>
</footer>
-->
            
          
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body {
  max-width: none;
  padding: 0;
}

*, *::after, *::before {
  -moz-box-sizing: inherit;
  -webkit-box-sizing: inherit;
  box-sizing: inherit;
}

footer {
  width: 100%;
  position:fixed;
  bottom: 0;
}

[class^="menu_container"] {
  margin: 0;
  padding: 0 2.618rem;
  background-color: #4B3D5A;
}

.menu {
  display: flex;
  max-width: 34rem;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-start;
  list-style: none;
  margin: 0;
  padding: 0;
}
.menu li {
  margin: .618rem;
  
  flex: 1 1 0;
  text-align: center;
}

[class*="menu_lnk"],
[class*="menu2_lnk"] {
  padding: .618rem;
  color: #fff;
  z-index: 5;
  text-decoration: none;
  
  position: relative;
  display: block;
  background-color: #4B3D5A;
}
[class*="menu2_lnk"]:focus,
[class*="menu_lnk"]:focus {
  outline: 1px solid transparent;
}

[class*="menu2_lnk"]::before {
/*   background-color: black; */
  background-image: url(#bg_goo);
  background-size: contain;
  content: " ";
  display: block;
  position:absolute;
  top:0;
  left:0;
  width: 100%;
  height: 100%;
  z-index: 5;
}



/* Menu link ::before has the wobble */

[class*="menu_lnk"]::before {
  background-color: black;
  background-color: #0e001d;
  content: "";
  display: block;
  position:absolute;
  top:0;
  left:0;
  width: 100%;
  height: 100%;
  z-index: -1;

 /* This was ignored by Chrome
  transition: transform .3s ease-out,  opacity .3s ease-out;
  transform: scale(0);
  opacity: 0; */
  
  /* Testing filter transition instead, not quite the same though */
  transition: -webkit-filter .3s ease-in,  filter .3s ease-in;
  -webkit-filter: blur(2px) opacity(0%);
  filter: blur(2px) opacity(0%);

  border: 3px solid #000;
  margin-top: -3px;

  animation: menu-hover-off .5s ease-out forwards;

}

[class*="menu_lnk"]:hover::before,
[class*="menu_lnk"]:focus::before {
  
  /* Ignored by Chrome
  transform: scale(1.1, 1.2);
  opacity: 1;*/
  
  -webkit-filter: blur(2px) opacity(100%);
  filter: blur(2px) opacity(100%);
  
  animation: menu-hover-on 1s ease-in .25s infinite;
}

/* variance */
.menu_lnk-1::before {
  border-radius: .5rem 100%;
}
.menu_lnk-2::before {
  border-radius: 1rem 50%;
}
.menu_lnk-3::before {
  border-radius: .5rem 2rem .5rem 100%;
}
.menu_lnk-4::before {
  border-radius: 1rem 100% 100% 100% ;
}

/* Rectangular objects */
@keyframes menu-hover-on {
  0% {transform: rotate(0deg); border-radius: .5rem 100%;}
  10% {transform: rotate(-4deg); border-radius: 25% 100% 25% 50%}
  20% {transform: rotate(0deg); border-radius: .5rem 100%;}
  30% {transform: rotate(-4deg); border-radius: 25% 50% 25% 100%;}
  40% {transform: rotate(0deg); border-radius: .5rem 100%;}
  50% {transform: rotate(0deg); border-radius: 100%;}
  60% {transform: rotate(0deg); border-radius: .5rem 100%;}
  70% {transform: rotate(4deg); border-radius: 100% 25% 50% 25%;}
  80% {transform: rotate(0deg); border-radius: .5rem 100%;}
  90% {transform: rotate(4deg); border-radius: 50% 25% 100% 25%}
  100% {transform: rotate(0deg); border-radius: .5rem 100%;}
}

@keyframes menu-hover-off {
  0% {transform: scale(1); opacity: 1}
  100% {transform: scale(0); opacity: 0}
}



/* Sliders */

section {
  margin-top: 3rem;
}
label {
  display: block; 
  margin: 1rem;
}
[type="range"] {
  vertical-align:bottom
}


/* Playing with border values */

.border0 ::before {
  border-width: 0px;
}
.border1 ::before {
  margin-top: -1px;
  border-width: 1px;
}
.border2 ::before {
  margin-top: -2px;
  border-width: 2px;
}
.border3 ::before {
  margin-top: -3px;
  border-width: 3px;
}
.border4 ::before {
  margin-top: -4px;
  border-width: 4px;
}
.border5 ::before {
  margin-top: -5px;
  border-width: 5px;
}


/* Playing with blur values */

.blur0 ::before {
  -webkit-filter: blur(0);
  filter: blur(0);
}
.blur1 ::before {
  -webkit-filter: blur(1px);
  filter: blur(1px);
}
.blur2 ::before {
  -webkit-filter: blur(2px);
  filter: blur(2px);
}
.blur3 ::before {
  -webkit-filter: blur(3px);
  filter: blur(3px);
}
.blur4 ::before {
  -webkit-filter: blur(4px);
  filter: blur(4px);
}
.blur5 ::before {
  -webkit-filter: blur(5px);
  filter: blur(5px);
}


/* This only works on round objects */
@keyframes menu-hover-on-i-ROUND {
  0% {transform: scale(1) rotate(0deg); border-radius: 50%}
  10% {transform: scale(1) rotate(30deg); border-radius: 20% 50% 30% 50%}
  20% {transform: scale(1) rotate(0deg); border-radius: 50%}
  30% {transform: scale(1) rotate(-30deg); border-radius: 20% 50% 30% 50%}
  40% {transform: scale(1) rotate(0deg); border-radius: 50%}
  50% {transform: scale(1) rotate(30deg); border-radius: 50% 20% 50% 30%}
  60% {transform: scale(1) rotate(0deg); border-radius: 50%}
  70% {transform: scale(1) rotate(-30deg); border-radius: 50% 30% 50% 20%}
  80% {transform: scale(1) rotate(0deg); border-radius: 50%}
  90% {transform: scale(1) rotate(30deg); border-radius: 20% 20% 30% 30%}
  100% {transform: scale(1) rotate(0deg); border-radius: 50%}
}
            
          
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