🚨 Error: Illegal invocation

Details
---
**Error report:** [link](http://go/ampe/CPr91rzliqun8AE)
**First seen:** Mar 31, 2020
**Frequency:** ~ 5,715/day

Stacktrace
---

Error: Illegal invocation

    at createEvent (src/dom.js:977:35)

    at dispatchCustomEvent (src/custom-element.js:731:10)

    at applySize (src/service/resource.js:397:24)

    at changeSize (src/service/resources-impl.js:1058:27)

    at mutateWork_ (src/service/resources-impl.js:1838:10)

    at callback (src/finite-state-machine.js:72:6)

    at setState (src/service/resources-impl.js:783:33)

    at doPass (src/service/resources-impl.js:691:34)

    at callback (src/service/vsync-impl.js:470:16)

Notes
---
`@dvoytenko` modified `src/dom.js:975-978` in #31058 (Nov 11, 2020)
`@rsimha` modified `src/custom-element.js:731-734` in #21212 (May 16, 2019)
`@choumx` modified `src/service/resource.js:397-397` in #27215 (Mar 17, 2020)
`@jridgewell` modified `src/service/resources-impl.js:1837-1839` in #1637 (Mar 18, 2016)
`@jridgewell` modified `src/finite-state-machine.js:63-78` in #1637 (Mar 18, 2016)
`@dvoytenko` modified `src/service/resources-impl.js:783-783` in #24566 (Sep 20, 2019)
`@jridgewell` modified `src/service/resources-impl.js:691-691` in #9789 (Jun 8, 2017)
`@jridgewell` modified `src/service/vsync-impl.js:470-471` in #20836 (Feb 14, 2019)

**Seen in:**
- 01-09 Nightly (0132)
- 12-23 Control (2217)
- 12-23 Nightly-Control (2217)
- 12-23 Stable (2217)
- 12-30 Experiment-A (1722)
- +2 more

**Possible assignees:** `@jridgewell`

/cc @ampproject/release-on-duty