Can Lt check for spelling errors when authoring content?

Since Lt is Browser-based, any in-built spellcheck tools your Browser has enabled will apply to any text fields you author:
servlet.ImageServer?id=015w0000002llhT&oid=00D20000000HncM

servlet.ImageServer?id=015w0000002llhT&oid=00D20000000HncM

Lt text panel with Firefox spellcheck enabled

Lt text panel without Firefox spellcheck enabled

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First Name: required First name is required and must be a string.

Last Name: required Last name is required and must be a string.

Email: required A valid email address is required.