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The editor canvas becomes an iframe (blob) under certain conditions, but there is a tag I would like to see added to the embedded html generated when this happens.
In my environment, when adding images to an article, I sometimes use relative URLs instead of absolute URLs.
In that case, the image in the iframe cannot be previewed.
To solve this problem, you need to add a base tag to the header part of the html in the iframe.
Here is an example
<iframe>
<head>
...
<base href="https://projectdmc.org/support/topic/when-editor-becomes-an-iframe-relative-path-content-is-not-displayed-correctly/{WP_HOME_URL}" />
</head>
<body>
...
</iframe>Please consider this.