Floating elements disappear when duplicating page

[ewingrj]

Notice the date does not render on the 2nd page.

#!/usr/bin/env python
from weasyprint import HTML

if __name__ == "__main__":
    doc = HTML(string='''
    <style>
    h2 {
        margin-top: 8px;
        margin-bottom: 8px;
    }

    .items {
        clear: both;
        border-collapse: collapse;
        color: #333;
        width: 100%;
    }


    .items tr:nth-child(even) {
        background: #eee;
    }

    .items tr:first-child {
        background: white;
    }

    .items td, th {
        border: 1px solid #ccc;
        padding: 0.5em;
    }

    .items th {
        border: none;
        text-align: center;
    }

    .items tbody {
        border-bottom: 3px solid black;
    }

    .items .qty {
        text-align: right;
        width: 40px;
    }
</style>


<h3 style="">Disappearing header</h3>
<p style="float: right">Oct. 24, 2019</p>

<table class="items">
    <tr>
        <th>Item</th>
        <th class="qty">Qty</th>
    </tr>

    <tbody>
    
        <tr>
            <td>shirt</td>
            <td class="qty">1</td>
        </tr>
   
    </tbody>
</table>
''').render()

    doc = doc.copy(doc.pages + doc.pages)
    doc.write_pdf('example.pdf')

[Tontyna]

There is no need to copy the doc to make floats disappear -- just write_* twice:

snippet = '<div style="float:left">lorem ipsum</div>'
doc = HTML(string=snippet).render()

doc.write_pdf('example.pdf')
doc.write_png('example.png')

There is no "lorem ipsum" in the png.

This is a feature of StackingContext.from_page(), manipulating the (original! Pointers! no copies!) page box tree to facilitate the correct paint order (z-index, floats etc.) -- floating boxes are removed from the original tree.

[balliegojr]

I am having the same problem.

In my case, I'm using the PdfGenerator from the Tips & Tricks page, to generate the headers of the document.
Floating elements will appear only in the header of the first page

First page:

Second Page:

[liZe]

Discussion continues in #1081, with other infamous examples.