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[FEATURE]: skip type="text/javascript" attribute in <script> tag of HTML output #5449
Description
Description
plotly.py's HTML output of the write_html() function currently adds a type attribute to the script tag, which is discouraged and causes a warning in the HTML validator:
<script type="text/javascript">
Why should this feature be added?
Standard Javascript code is the default for the <script> tag in HTML, adding a type attribute to declare that default is unnecessary.
The current HTML5 spec explicitly discourages setting it:
"Omitting the attribute, setting it to the empty string, or setting it to a JavaScript MIME type essence match means that the script is a classic script, to be interpreted according to the JavaScript Script top-level production. Authors should omit the type attribute instead of redundantly setting it."
Source: https://html.spec.whatwg.org/multipage/scripting.html#attr-script-type
Activity
robertclaus commentedon Dec 17, 2025
@hannob this is a great callout. This might be a very simple change in the codebase if you are interested in opening a PR for it.
Remove unneeded `type="text/javascript"` attribute from `<style>` tag
hannob commentedon Dec 22, 2025
I tried a PR here: #5454
CI first failed due to a ruff formatting issue, which I fixed, now it fails with some doc issue, not sure why...
lalithu commentedon Jan 12, 2026
Hi! I’m new to contributing but happy to help debug the remaining CI/doc failure. I’ll try to reproduce it locally and report back.