--- title: "Identifying Accessibility Data Gaps in CodeGen Models :: Aaron Gustafson" url: https://daily.dev/posts/identifying-accessibility-data-gaps-in-codegen-models-aaron-gustafson-xcy5len3b source_url: https://www.aaron-gustafson.com/notebook/identifying-accessibility-data-gaps-in-codegen-models type: article source: "Aaron Gustafson" published: 2026-07-05T07:21:33.613Z updated: 2026-07-05T07:21:59.276Z tags: ["llm", "html", "accessibility"] reading_time: 9 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Identifying Accessibility Data Gaps in CodeGen Models :: Aaron Gustafson **[Aaron Gustafson](https://daily.dev/sources/aaron_gustafson)** · 9 min read · 0 upvotes · 0 comments ## Summary A systematic study evaluating GPT-4's ability to generate accessible HTML code reveals consistent failures: missing form labels, redundant or misapplied ARIA attributes, incorrect use of `required` on checkbox groups, missing fieldset/legend structures, and color-only error states. The author built a Python testing framework that sent prompts to Azure OpenAI's GPT-4, generated 10 iterations per prompt at high temperature, and manually reviewed each output for accessibility compliance. A key finding is that including diff-based accessibility hints in prompts dramatically improved output quality, suggesting the root cause is insufficient accessible code in training data rather than fundamental model incapability. Proposed solutions include curating open-source accessible code datasets, accessibility-aware fine-tuning, integrating accessibility linting into IDE AI tools, and embedding accessibility guidance into default system prompts. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [AI will soon deliver code that will pass automatic testing by default – Bogdan on Digital Accessibility \(A11y\)](https://daily.dev/posts/ai-will-soon-deliver-code-that-will-pass-automatic-testing-by-default-bogdan-on-digital-accessibil-eb5n7kvf9) · Bogdan on A11y · 1 upvotes · 0 comments - [AI has an accessibility problem: What devs can do about it](https://daily.dev/posts/ai-has-an-accessibility-problem-what-devs-can-do-about-it-tszlnfkhw) · LogRocket · 0 upvotes · 0 comments - [AI-Generated UI Is Inaccessible by Default – Frontend Masters Blog](https://daily.dev/posts/ai-generated-ui-is-inaccessible-by-default-frontend-masters-blog-ikugehhcg) · Frontend Masters · 2 upvotes · 0 comments --- Tags: [#llm](https://daily.dev/tags/llm), [#html](https://daily.dev/tags/html), [#accessibility](https://daily.dev/tags/accessibility) [View this post on daily.dev](https://daily.dev/posts/identifying-accessibility-data-gaps-in-codegen-models-aaron-gustafson-xcy5len3b)