Different Delimiters To Seperate Attributes In Html Tags

What are different delimiters used to separate HTML attributes when spaces,double quotes,single quote are not allowed

Solution 1:

By default, SGML requires that all attribute values be delimited using either double quotation marks (ASCII decimal 34) or single quotation marks (ASCII decimal 39). [w3.org]

HTML attributes follow the SGML definition of attributes, therefore you cannot have a HTML attribute without these characters. If " and ' are not allowed then you cannot write valid HTML.