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The spellcheck attribute of textarea can be read in this MDN document:
true, which indicates that the element should be, if possible, checked for spelling errors;
false, which indicates that the element should not be checked for spelling errors.
If this attribute is not set, its default value is element-type and browser-defined.
If there is a textarea, the anonymous messages can be seen in the console dev tools if a spellchecker extension like Becorrect is installed on Chrome (or another browser).
This messages will not appear if the spellcheck value is set to false or if the extension is disabled.
Source:stackexchange.com