HTML validation reports error for certain valid HTML

### Apache NetBeans version

Apache NetBeans 29

### What happened

The following HTML give errors in NB:

` `
NB says that importmap is not a valid script type.

`<iframe width="100%" height="400" src="..."></iframe>`
NB says that the width may not have a % in the property value.

`<img src="..." width="80%" />`
NB says that the width may not have a % in the property value.

### Language / Project Type / NetBeans Component

HTML pages and JSP pages

### How to reproduce

NB reports these errors if HTML validation is turned on and an HTML or JSP page includes the properties on the tags above. It will mark the line in red and the error can be identified in the tooltip that pops up when putting the mouse over the red line.

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

MacOS

### JDK

JDK25

### Apache NetBeans packaging

Community provided installer

### Anything else

_No response_

### Are you willing to submit a pull request?

No

Reproduce the report with HTML and JSP pages while HTML validation is enabled, using the importmap script type and percentage width values shown in the issue. Trace the validation errors reported in the editor tooltips; done when these valid constructs no longer produce errors.

Written by the indexing model from the issue text.