Use 'warn' event instead of 'error' when the error is not fatal - When resolving EPUB CFI or epage failed, emit a 'warn' event and continue operation.
Use 'warn' event instead of 'error' when the error is not fatal
- When resolving EPUB CFI or epage failed, emit a 'warn' event and continue operation.

vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js,vivliostyle/vivliostyle.js