title: What is the meaning of download property in ionic 4 ion-button?
body: <p>I would like to implement a download button in a web app developed with ionic 4. I read that I can add a download property in ion-button </p>
  
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      <p>Download: This attribute instructs browsers to download a URL instead of navigating to it, so the user will be prompted to save it as a local file. If the attribute has a value, it is used as the pre-filled file name in the Save prompt (the user can still change the file name if they want).</p>
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  <p>It seems that the attribute will be the file name in the save prompt, so my question is where to put the download url.</p>