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                <data value="i">
  <i class="fa fa-info-circle center datatitle" data-title=""></i>

  Attribute data-title, vertical balance & type granularity
  <sub>Data attribute watermark, center balance <i class="fa fa-info-circle datatitle"></i> type granularity</sub>

    .datatitle { position: relative; }
    .datatitle:after { content: attr(data-title); display: none; position:absolute; } relative to .center
Most CSS style declarations work well with HTML data-title attribute. Opacity of hover:after element is restricted by content attr(data-title) and class center. 

	<li>Layout alignment - BINGO !! LAYOUT IS CRITICAL - conclusion preceeding deliberation</li>
	<li>Positioning .datatitle:hover::after is messy, say for instruction overlay ...<span class="datatitle" id="Gale">Gale</span></li>
  <li>Gale blows out additional specificity issue (s)</li>
<p>Enlarge <code>.center{font-size: 85vmin;}</code>: data-title positioning as expected is restricted by window sizes, including scroll-bars that ignore typographic viewport size in relation to scroll-bar display, for Safari. Method involves viewport adjustments to % and rem measure, in deploying typography apps, like Transform translations -50% and -100% define modal model balance. Each online font character represents a streamed app.
<i class="fa fa-info-circle datatitle"></i> 2019-Apr-03
<i class="fa fa-info-circle datatitle"></i>

<h2>Lorem ipsum dolor <i class="fa fa-info-circle datatitle"></i> sit amet <span class="i">‘i’</span> consectetur!</h2>

<!-- resolved
<li>Works with codepen, with restriction</li>
Can also use: <code>top:2rem;</code>, with another style behavior destabilizing Codepen display of this tooltip. Codepen framing could be the problem.<br> ...Attributes anchor position relative to specific element, herein the typography font app. Codepen api may show weakness here, due to corruption of tool-tip position: unlike on desktop, the large centered SVG icon font tool-tip in codepen is not positioned correctly here, in Safari. <code>.center{transition:inherit;}</code> that sometimes helps style grouped features, no help. Codepen data-title fail on large icon is preceded and followed by correct tool-tip positioning. Class selector <code>.center{font-size:5vmin;}</code> presents no problem. Codepen shows problems when font-size is larger: <code>.center{font-size:85vmin;}</code>. This suggests similar problems in similar environments, elsewhere. FontAwesome, other remote services may also be disrupting Codepen display of code.


                body {
  font-size: 1rem;
  padding: 2.5vh 5vw;
.datatitle {
  color: dodgerblue;
  opacity: 1.0;
  position: relative;
.datatitle::after {
	content: attr(data-title);
	display: none;
	position: absolute;
	-webkit-transform: translatey(50%);
	-moz-transform: translatey(50%);
	-o-transform: translatey(50%);
	transform: translatey(50%);
.datatitle:hover {
  color: forestgreen;
  cursor: pointer;
.datatitle:hover::after {
  background: yellow;
  display: inline-block;
  left: 30vw;
  font-size: 2.5vw;
  float: left;
  top: 3vh;
.center { /*fa*/
  color: gainsboro;
  font-size: 35vmin;
  left: 50%;
  opacity: 0.95;
  position: absolute;
  top: 50%;
  -webkit-transform: translatex(-50%) translatey(-100%);
  -moz-transform: translatex(-50%) translatey(-100%);
  -o-transform: translatex(-50%) translatey(-100%);
  transform: translatex(-50%) translatey(-100%);
body:hover .center, body:hover i, body:hover .i, #Gale:hover {
  color: chartreuse;
  opacity: 1.0;
body:hover p, body:hover ul {
  opacity: 0.1;
body:hover {
  cursor: help;