No, an HTML element cannot have multiple IDs. According to the recommendation, the `id` attribute must contain a unique identifier within the document; the following code is illegal, and the behavior on browsers will be unpredictable when an element has multiple `id`s: `id=\\\"nested_element_123 task_123\\\"`.
Attach a class attribute whenever you are linking two or more identifiers to one element, which is alright because classes can hold many values-for example, in the above example `class="nested_element_123 task_123"`.