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Boolean attributes
Boolean attributes are recognized as follows in this library:
| Attribute value | Example | Recognized value |
|---|---|---|
| (unspecified) | <phi-button> | false |
"" (empty string) | <phi-button disabled> | true |
"0" or "false" | <phi-button disabled=0> | false |
| any other non-empty string | <phi-button disabled="no"> | true |