Rule: Alt text must not include filename

Rule ID	Image 3
Conformance	Required
Definition	The source filename of the image element must not be part of its text alternative.
Purpose	A text alternative should summarize the purpose of an image for people with visual impairments. The source filename of the image should not be included because generally it is not useful information. An image with a text alternative that is an empty string is ignored by assistive technologies, and indicates that it is being used for styling purposes rather than meaningful content.
Conformance	Required
WCAG Success Criteria	Success Criterion 1.1.1 Non-text Content Other Related Success Criterion:
Rule Category	Images
Rule Scope	Element
Techniques	A text alternative should describe the purpose of an image as succinctly as possible (preferably with no more than 100 characters). Do not include the source filename as part of the text content. The `alt` attribute is the preferred and most commonly used way to provide a text alternative for `img` and `area` elements. The `aria-labelledby` attribute can be used to provide a text alternative when images can be described using text already associated with the image, such as a visible caption, or for elements with `role="img"`. The `aria-label` attribute should only be used to provide a text alternative in the special case when an element has a `role="img"` attribute. The `title` attribute will be used by assistive technologies to provide a text alternative if no other specification technique is found.
Information Links	HTML Specification: IMG element ALT Attribute G94: Providing text alternative for non-text content that serves the same purpose and presents the same information as the non-text content G95: Providing text alternatives that provide a brief description of the non-text content F30: Failure of Success Criterion 1.1.1 and 1.2.1 due to using text alternatives that are not alternatives (e.g., filenames or placeholder text)