California keeps its own statute. Probate Code section 4151 lets a principal revoke according to the terms of the instrument or by a writing, and that right cannot be limited by the power of attorney itself. Under Probate Code section 4154, dissolution or annulment of the marriage to the attorney in fact revokes that designation automatically. For real property, Civil Code section 1216 is the hard rule: a recorded power to convey is not revoked as against third parties unless the revocation is acknowledged, certified, and recorded in the same office.
Texas codifies the uniform framework in chapter 751 of the Estates Code. Section 751.135 says plainly that a previous durable power of attorney continues in effect until revoked, and section 751.132 governs termination of an agent's authority. Sections 751.054 and 751.055 protect a person acting without actual knowledge and let that person demand an agent's affidavit. Where the agent signs a recordable real property instrument, section 751.151 puts the durable power in the county clerk's file within thirty days, so the revocation belongs there too.
Florida addresses revocation directly at section 709.2110 of the Florida Statutes. A principal revokes by expressing the revocation in a later power of attorney or in another writing signed by the principal, and subsection (2) confirms that a new POA does not otherwise cancel an earlier one. Notice to the agent is permitted rather than required by that text, but section 709.2119 makes it decisive, since a third person who knows of the termination loses the right to rely.
New York is the most procedural state in the group. General Obligations Law section 5-1511(3) requires delivery of the revocation to the agent in person, or dispatch of a signed and dated revocation to the agent's last known address by mail, courier, electronic transmission, or facsimile. Subsection (4) requires recording where the power was recorded under Real Property Law section 294, and subsection (5) gives a financial institution actual notice only once it has had a reasonable opportunity to act on written notice received at the office holding the account.
Illinois runs the Illinois Power of Attorney Act, 755 ILCS 45. Section 2-8 lets anyone acting in good faith on a copy of the agency presume it has not been revoked, absent actual knowledge. The counterweight sits in section 2-8(f)(9), which makes actual notice of revocation a reasonable cause to refuse the document.