The webpage contains duplicate ID attribute value "x" that has been identified

In my Angular 7 project, three components (a, b, c) all use an input element with the same id of "x". However, component b has 4 input elements all using the id "x" as well. This poses Accessibility Issues as ids must be unique. The test cases utilize 'getElementById' to retrieve values and expect specific outcomes.

To address this issue, I have switched these id selectors to classes, since uniqueness is not needed, and also updated the test cases to use 'querySelector.'

Despite these changes, I am still encountering errors stating: 'Duplicate id attribute value "x" found on the web page.' Any suggestions on how to resolve this?

javascripthtmlcssaccessibilityangular7

Answer №1

Regarding accessibility, the WCAG 4.1.1 Parsing guideline emphasizes the importance of having unique IDs in valid HTML. The guideline outlines four specific types of invalid HTML that could potentially lead to accessibility issues:

  1. "elements have complete start and end tags,
  2. elements are nested according to their specifications,
  3. elements do not contain duplicate attributes,
  4. and any IDs are unique,"

While there are various ways to have invalid HTML, these four types can specifically cause accessibility challenges. It's worth noting that having any of these issues signifies invalid HTML, which indicates a broader problem beyond just accessibility concerns.

In your situation, it appears that the fourth listed error is what you've encountered. According to the HTML spec, IDs must be unique.

When specified on HTML elements, the id attribute value must be unique amongst all the IDs in the element's tree and must contain at least one character.

You mentioned:

The test cases use 'getElementById' to retrieve the values and expect something.

If you have duplicate IDs, what do you expect to receive from getElementById? As stated in the spec for getElementById:

Since element IDs are required to be unique if specified, they serve as an efficient means to swiftly access a particular element.

You also noted:

Now what I have done is change these id selectors to classes...

Does this imply that none of your elements possess an ID and only have classes? If an accessibility scanning tool is flagging an error related to duplicate IDs, it suggests that not all IDs were converted to classes as intended.

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