Many remote materials don't allow being used in a iframe

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This is an old problem which stems from some unfortunate the security design of the iframe system. A security threat (a form of click fishing by a malicious embedding site) was fixed by recommending that web publishers is iframe HTTP headers to block their material being used by different origins. At a stroke, this made the web a whole lot less useful and compostable.

Sites which do work include:

• Solid servers
• Google docs
• Medium

Sites which do not include:

• this github issue web page
• Altassian Jira tools
• eff.org

One solution, in Chrome, is to use <webview> which seems specifically designed to solve this problem. See https://developer.chrome.com/apps/tags/webview

A longer term solution is to push for changes in the browsers ...