[i18n-activity] Strengthen advice on string identity (#1484)

aphillips has just created a new issue for https://github.com/w3c/i18n-activity:

== Strengthen advice on string identity ==
## Proposed comment

Defining Custom Properties: the [--*]() family of properties

> Different OSes or input methods can sometimes output visually-identical text with different codepoints, so authors should be aware of this potential hazard.

This relates to this requirement:

> Unlike other CSS properties, custom property names are not [ASCII case-insensitive](https://infra.spec.whatwg.org/#ascii-case-insensitive). Instead, custom property names are only equal to each other if they are [identical to](https://infra.spec.whatwg.org/#string-is) each other.

In Example 2, the spec calls out that the term *identical to* refers to the underlying Unicode code points. The advice to authors could be stronger here. Perhaps:

> Operating systems, keyboards, or input methods sometimes encode visually-identical text using different codepoint sequences. Authors are advised to choose variable names that avoid potential confusion or to use escapes and other means to ensure that similar appearing sequences are identical.

We might also suggest including a link to charmod-norm for additional information.

## Instructions: 

This follows the process at https://w3c.github.io/i18n-activity/guidelines/review-instructions.html

1. Create the review comment you want to propose by replacing the prompts above these instructions, but **LEAVE ALL THE INSTRUCTIONS INTACT** 

2. Set a label to identify the spec: this starts with s: followed by the spec's short name. If you are unable to do that, ask a W3C staff contact to help.

3. Ask the i18n WG to review your comment.

4. After discussion with the i18n WG, raise an issue in the repository of the WG that owns the spec. Use the text above these instructions as the starting point for that comment, but add any suggestions that arose from the i18n WG. In the other WG's repo, add an 'i18n-needs-resolution' label to the new issue. If you think any of the participants in layout requirements task force groups would be interested in following the discussion, add also the appropriate i18n-\*lreq label(s).

5. Delete the text below that says 'url_for_the_issue_raised', then add in its place the URL for the issue you raised in the other WG's repository. Do NOT remove the initial '§ '. Do NOT use \[...](...) notation – you need to delete the placeholder, then paste the URL.

6. Remove the 'pending' label, and add a 'needs-resolution' tag to this tracker issue. 

7. If you added an \*lreq label, add the label 'spec-type-issue', add the corresponding language label, and a label to indicate the relevant typographic feature(s), eg. 'i:line_breaking'. The latter represent categories related to the Language Enablement Index, and all start with i:.

8. Edit this issue to **REMOVE ALL THE INSTRUCTIONS & THE PROPOSED COMMENT**, ie. the line below that is '---' and all the text before it to the very start of the issue.


**This is a tracker issue.** Only discuss things here if they are i18n WG internal meta-discussions about the issue. **Contribute to the actual discussion at the following link:**

§ url_for_the_issue_raised

Please view or discuss this issue at https://github.com/w3c/i18n-activity/issues/1484 using your GitHub account

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Received on Tuesday, 1 March 2022 16:50:33 UTC