Which of the following file types would not be considered a non-proprietary web standard?

Question

BlackTom AI · Accepted Answer

PSD is Adobe's proprietary Photoshop document format, so file.psd is not a non-proprietary web standard.

1) Relevant knowledge points and concepts
- Web standards are formats specified and maintained by standards bodies (e.g., W3C, WHATWG) and are open for web authors and browsers to implement.
- HTML (HyperText Markup Language), CSS (Cascading Style Sheets), and SVG (Scalable Vector Graphics) are open, standardized technologies for structuring, styling, and vector graphics on the web.
- PSD (Photoshop Document) is a native, binary file format created by Adobe for layered image editing; it is proprietary to Adobe and not a web standard.

2) Step-by-step reasoning
- Evaluate file.html: HTML is the core markup language of the web and an open standard (WHATWG/W3C). Therefore it is non-proprietary.
- Evaluate file.css: CSS is a W3C standard for styling web pages and is non-proprietary.
- Evaluate file.svg: SVG is an XML-based vector image format standardized by the W3C and supported natively by browsers; it is non-proprietary.
- Evaluate file.psd: PSD is intended for image editing in Adobe Photoshop; browsers do not natively render PSD files as web images. The format is controlled by Adobe and is not a web standard.

3) Intermediate steps / evidence
- HTML, CSS, SVG specifications are published openly and implemented across browsers.
- Common web image formats derived from open or widely supported specs include PNG, JPEG, GIF, and SVG; PSD is not among these and is primarily for editing workflows.

4) Why the correct answer is correct
- file.psd is proprietary to Adobe and not maintained as an open web standard, so it would not be considered a non-proprietary web standard.

5) Why other options are incorrect
- file.html, file.css, file.svg: each is an open, standardized web technology (implemented by browsers and governed by standards bodies), so they are non-proprietary web standards.
- "All are non-proprietary web standards": incorrect because PSD is proprietary.

6) Conclusion
Therefore, the correct choice is file.psd, which matches the provided answer.

Which of the following file types would not be considered a non-proprietary web standard?单项选择题

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