Deprecation: control flow attributes - marko-js/marko GitHub Wiki

The inline control flow attributes if, while, and for are deprecated in favor of their tag counterparts: <if>, <while>, and <for>.

Here’s an example of how to migrate (and hopefully illustrates why you should):

<img class="large-image placeholder" src="https://via.placeholder.com/350x150" aria-describedby="my-fancy-component" if(input.show) />

…now becomes:

<if(input.show)>
  <img class="large-image placeholder" src="https://via.placeholder.com/350x150" aria-describedby="my-fancy-component" />
</if>

To automatically fix deprecated marko syntax, try the marko migrate command from the CLI.

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