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<iframe sandbox="" class="ic-iframe" title="Check Social Share Images" tabindex="-1" src="https://example.com"></iframe>
However, the MDN entry on the sandbox attribute of iframes states that it can be empty to apply all restrictions (on https://developer.mozilla.org/en-US/doc ... ent/iframe):The "sandbox" attribute for this "iframe" element (with class="lv-iframe") has an empty or missing value. The expected value is one of the following: an alphanumeric string, no value, or a string.
Wouldn't the Validator therefore be incorrect in reporting this as an error?sandbox
Applies extra restrictions to the content in the frame. The value of the attribute can either be empty to apply all restrictions, or space-separated tokens to lift particular restrictions:
[various attribute values are then listed]