René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"unreleased-message not in old versions.","articleBody":"In #49 we added banner at the top of all the old html pages that is \u003cdiv tag='unreleased-message'\u003e but there is no CSS for that tag before 2.0.2 and older.  Need to add the following to `_static/mpl.css`\r\n\r\n```css \r\n/* \"Go to released version\" message. */\r\n#unreleased-message {\r\n  background: #d62728;\r\n  box-sizing: border-box;\r\n  color: #fff;\r\n  font-weight: bold;\r\n  left: 0;\r\n  min-height: 3em;\r\n  padding: 0.7em;\r\n  position: fixed;\r\n  top: 0;\r\n  width: 100%;\r\n  z-index: 10000;\r\n}\r\n\r\n#unreleased-message + div {\r\n  margin-top: 3em;\r\n}\r\n\r\n#unreleased-message a {\r\n  color: #fff;\r\n  text-decoration:underline;\r\n\r\n}\r\n```","author":{"url":"https://github.com/jklymak","@type":"Person","name":"jklymak"},"datePublished":"2021-02-12T15:30:45.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/54/matplotlib.github.com/issues/54"}