The iframe module is great for enforcing required attributes like title (for accessibility), width/height (for responsive scaling to maintain an aspect ratio) and many third-party websites that generate iframe embed codes may or may not include these attributes.
However it is complicated for non-technical web editors who want to just paste in an embed code. It takes extra time to separate out values like the "src" "width" and "height" from auto-generated iframe embed codes provided by third-party websites.
<iframe> embed code as an alternative to the "src" field as an initial step. Two approaches should be supported:
1. Client-side parsing and attribute extraction:
The iframe field could be a client-side generated dynamic/temporary field that is not saved server-side, but serves only to be able to display the original embed code pasted into the "src" field for reference and to extract attribute values from.
2. Server-side parsing and attribute extraction:
If an <iframe> embed code is entered into the src field and sent to the drupal php backend, then it should be automatically detected and valid attributes should be extracted into their respective fields during presave.
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