The part about "boolean attributes" can be more clear.

[oebrab]

The doc about boolean attributes says:

If isButtonDisabled has the value of null or undefined, the disabled attribute will not even be included in the rendered <button> element.

To be more clear, not only null or undefined, all falsy values mean not disabled, while all truthy values mean disabled.

[skirtles-code]

I think there may be even more nuance lurking beneath the surface here.

From what I can tell:

• Normal (non-boolean) attributes will be omitted if their value is undefined or null. All other values are converted to strings.
• For boolean attributes the values undefined, null, false, 0 and NaN will lead to the attribute being omitted. All other values, including an empty string, will result in the attribute being included, though without a value.

[oebrab]

Thanks! Learned a lot.

[skirtles-code]

I'm going to have a go at updating this unless I hear otherwise.