This mimics the official tweet button that Twitter provides (the large one). Prevents flash of unstyled content

twitter-button.css

/* twitter button */
.twitter-btn {
  width: 76px;
  display: inline-block;
  overflow: hidden;
  text-align: left;
  white-space: nowrap;
  vertical-align: top:
  zoom: 1;
  font-size: 13px;
  line-height: 26px;
  font-family: "Helvetica Neue",Arial,sans-serif;
}
.twitter-btn a {
  height: 28px;
  padding: 1px 10px 1px 9px;
  border-radius: 4px;
  position: relative;
  font-weight: 500;
  color: #fff;
  cursor: pointer;
  background-color: #1b95e0;
  border-radius: 3px;
  box-sizing: border-box;
  display: inline-block;
  text-decoration: none;
}
.twitter-btn a:hover {
  background-color: #0c7abf;
}
.twitter-btn a i {
  width: 18px;
  height: 18px;
  top: 4px;
  position: relative;
  display: inline-block;
  background: transparent 0 0 no-repeat;
  background-image: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%2072%2072%22%3E%3Cpath%20fill%3D%22none%22%20d%3D%22M0%200h72v72H0z%22%2F%3E%3Cpath%20class%3D%22icon%22%20fill%3D%22%23fff%22%20d%3D%22M68.812%2015.14c-2.348%201.04-4.87%201.744-7.52%202.06%202.704-1.62%204.78-4.186%205.757-7.243-2.53%201.5-5.33%202.592-8.314%203.176C56.35%2010.59%2052.948%209%2049.182%209c-7.23%200-13.092%205.86-13.092%2013.093%200%201.026.118%202.02.338%202.98C25.543%2024.527%2015.9%2019.318%209.44%2011.396c-1.125%201.936-1.77%204.184-1.77%206.58%200%204.543%202.312%208.552%205.824%2010.9-2.146-.07-4.165-.658-5.93-1.64-.002.056-.002.11-.002.163%200%206.345%204.513%2011.638%2010.504%2012.84-1.1.298-2.256.457-3.45.457-.845%200-1.666-.078-2.464-.23%201.667%205.2%206.5%208.985%2012.23%209.09-4.482%203.51-10.13%205.605-16.26%205.605-1.055%200-2.096-.06-3.122-.184%205.794%203.717%2012.676%205.882%2020.067%205.882%2024.083%200%2037.25-19.95%2037.25-37.25%200-.565-.013-1.133-.038-1.693%202.558-1.847%204.778-4.15%206.532-6.774z%22%2F%3E%3C%2Fsvg%3E);
}
.twitter-btn a span {
  margin-left: 4px;
  white-space: nowrap;
  display: inline-block;
  vertical-align: top;
  zoom: 1;
}

usage.html

HTML to insert button:
<div class="twitter-btn">
  <a href="https://twitter.com/intent/tweet?text=A%20down%20to%201k%20replacement%20of%20jQuery&amp;url=http%3A%2F%2Fpicoquery.com"><i></i>
  <span>Tweet</span></a>
</div>

If you want a dialog to open, like with the official twitter button, you can include the official javascript.
It works on this button too.

<script>window.twttr = (function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0],
    t = window.twttr || {};
  if (d.getElementById(id)) return t;
  js = d.createElement(s);
  js.id = id;
  js.src = "https://platform.twitter.com/widgets.js";
  fjs.parentNode.insertBefore(js, fjs);

  t._e = [];
  t.ready = function(f) {
    t._e.push(f);
  };

  return t;
}(document, "script", "twitter-wjs"));</script>