Limitations

Complex HTML Elements
Various proposed HTML and HTML+ specifications allow parameters to be added to common HTML tags, such as <H2 ALIGN="center"> or even <P ID="p34">. While manually added parameters generally pose no problem in HTML.edit, unpredictable results may occur, especially with HTML structural elements. The parser for most of the structural commands expects them to be in a standard format, and may either ignore parameter-containing tags, or may eliminate the parameters. Non-structural tags containing parameters are generally ignored (ie., HTML.edit doesn't understand them).

Number of Documents
There is no inherent limit to the number of documents that can be stored within HTML.edit, other than the 30K character limit imposed by the text fields used for the document Index, and the available size of your hard disk.

Document Size
HTML.edit is not able to contain more than ~30K (29,996 characters) in a field. Documents can be larger than 30K when including the Header and Footer areas (and will export the complete contents of Header, Body and Footer), but imported documents will be truncated to 30K. Some functions also run into this 30K limit. If a future version of HyperCard allows for unlimited field lengths, I won't be the only one to breathe a sigh of relief.

There is a file size indicator in the Info Window, which displays the number of characters in the Header, Body and Footer sections. This indicator is updated on opening the document window, exiting the Header, Body or Footer areas, or clicking directly on the Info windoid.
It is in the format:

   file size in kilobytes: header size+body size+footer size chars

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