searching text in HTML spans with absolute positions

[Milan Hauth]

searching for the text "1 2 3"
in the html spans

```html
<span>1</span>  
<span>2</span>  
<span>3</span>
``` 

fails when the spans have
`style="position:absolute"`

also: clipboard text has no whitespace between words

also: triple-click does not select the whole paragraph

with chromium 137.0.7151.119
this works with SVG tspan elements
but not with HTML span elements

repro:
https://milahu.github.io/chromium-discuss-text-search-absolute-position-spans/test.html

use case:
EPUB-FXL = fixed-layout EPUB
useful for scanned books
allows better compression than PDF
https://github.com/internetarchive/archive-hocr-tools/pull/23

related:
https://stackoverflow.com/questions/62381455
How Do I make my HTML searchable by a browser Ctrl-F and use absolute text positioning?