Antora UI
Antora uses vinyl virtual filesystem aka content catalog
Data Attributes
Store extra information with HTML elements
How to data attributes are defined?
<div class="ct-chart"
  data-chart-height="400"
  data-chart-width="600">How to access data-attributes?
element.dataset.chartHeight
element.dataset.chartWidthUse Cases
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Show captions onHoveron certain elements
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Hide/Show some list items 
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Pass data to javascript libraries/modules to do something interesting, like generating chart 
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How to access keys from antora-playbook.ymlin partial templates?{{#with site.keys.googleAnalytics}}
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Prebuilt HTMLpages?Put them inside attachmentsdirectory then add a link to them innavfile
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What are HTML Data Attributes? If you want to operate on elements based on data attributes, Eg: drawing charts etc