This class of attributes, called custom data attributes, allows proprietary
information to be exchanged between the HTML and its DOM representation that
may be used by scripts. All such custom data are available via the HTMLElement
interface of the element the attribute is set on. The HTMLElement.dataset
property gives access to them.
The * may be replaced by any name following the production rule of xml names
with the following restrictions:
the name must not start with xml, whatever case is used for these letters;
the name must not contain any semicolon (U+003A);
the name must not contain capital A to Z letters.
Note that the HTMLElement.dataset attribute is a StringMap and the name of the
custom data attribute data-test-value will be accessible via
HTMLElement.dataset.testValue as any dash (U+002D) is replaced by the capitalization
of the next letter (camelcase).
This class of attributes, called custom data attributes, allows proprietary information to be exchanged between the HTML and its DOM representation that may be used by scripts. All such custom data are available via the HTMLElement interface of the element the attribute is set on. The HTMLElement.dataset property gives access to them.
The * may be replaced by any name following the production rule of xml names with the following restrictions:
the name must not start with xml, whatever case is used for these letters; the name must not contain any semicolon (U+003A); the name must not contain capital A to Z letters.
Note that the HTMLElement.dataset attribute is a StringMap and the name of the custom data attribute data-test-value will be accessible via HTMLElement.dataset.testValue as any dash (U+002D) is replaced by the capitalization of the next letter (camelcase).
MDN