a) allow-forms
b) seamless
c) embed
d) allow-scripts
Answer: b
Explanation: Embed attribute attach external content at a specified point in document. The seamless attribute is a boolean attribute. When present, it specifies that the iframe should look like it is a part of the containing document (no borders or scrollbars). Allow-forms re-enables from submission. Scripts are re-enabled by allow-scripts.
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