Chrome Version       : 68 (Windows 10) ; 67 (Mac High Sierra)
OS Version: Windows 10 ; Mac High Sierra

Other browsers tested:

    Chrome JAWS 2018 (Windows 10):  OK
    Firefox JAWS 2018 (Windows 10):  OK
    Edge NVDA (Windows 10):  OK
    Safari Voiceover (Mac High Sierra): OK
    Chrome Voiceover (Mac High Sierra): OK     

What steps will reproduce the problem?
1. Add aria-describedby attribute to <input type="text">, <input type="date", or <textarea>

2. Chrome Vox fails to recognize and read it

Chrome Vox will pick up and read aria-describedby if attribute added to parent <div> containing both <label> and <input> or <textarea> elements

With aria-describedby added to parent <div> (but not to <input> or <textarea>), all other screen readers (except NVDA) fail to read it

With same aria-describedby attribute added both to parent <div> and to <input> or <textarea>, NVDA reads it twice

Have not yet tested with other input types (checkbox, radio group, select, etc.)

All the documentation I've found recommends adding aria-describedby to the <input> or <textarea>, etc. element -- please consider aligning with the other major screen readers for simplicity and consistency