Layered navigation breaks HTML5 Validation

[ioweb-gr]

Preconditions (*)

1. Magento 2.3.1 using Luma Theme
2. Install sample data

Steps to reproduce (*)

1. Install magento 2.3.1
2. Install sample data
3. Navigate to category women/tops-women/hoodies-and-sweatshirts-women.html
4. Pass this page through the validator at http://validator.w3.org/
5. Multiple html5 errors for attributes that are not defined in the specification.

Expected result (*)

Validation passes with warnings only and no errors.

Actual result (*)

Multiple html5 errors due to layered navigaton

1. Error: Attribute option-type not allowed on element div at this point.
2. Error: Attribute option-id not allowed on element div at this point.
3. Error: Attribute option-label not allowed on element div at this point.
   etc etc

According to the specification custom attributes should be prefixed via data-
For example it would be proper to say data-option-type="..." but option-type="..." is invalid.

https://www.w3schools.com/tags/att_global_data.asp

[m2-assistant]

Hi @ioweb-gr. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

For more details, please, review the Magento Contributor Assistant documentation.

@ioweb-gr do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[ioweb-gr]

@magento-engcom-team give me 2.3-develop instance

[magento-engcom-team]

Hi @ioweb-gr. Thank you for your request. I'm working on Magento 2.3-develop instance for you

[magento-engcom-team]

Hi @ioweb-gr, here is your Magento instance.
Admin access: https://i-22363-2-3-develop.instances.magento-community.engineering/admin
Login: admin Password: 123123q
Instance will be terminated in up to 3 hours.

[ioweb-gr]

Is it possible to receive a Magento instance with sample data installed? This one is empty.

[m2-assistant]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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