What could be causing WebKit to fail in accurately redrawing this text?

I am experiencing a unique issue with the WebKit renderer. It seems that when a text node contains a descender or ascender that extends beyond the selection box of the text node, and the position of the text node changes, WebKit fails to repaint the correct region.

I have created an example using Open Sans font.

On Chrome running on Windows 7, the descender on the letter J is being cut off during the animation. I have found a workaround by adding margin to the text node, but this solution feels like a hack and disrupts the layout. I am curious if others have encountered this issue in different browsers and why it is happening.

htmlcsswebkit

Answer №1

Adding a padding-left: 5px; to the #container p style caused the letter J to appear outside of the container.

I hope this explanation is helpful.

*Update: I may have misinterpreted the issue, as the padding adjustment could potentially disrupt your overall layout.

Answer №2

It appears that there may be a bug in the Webkit browser. To address this issue, you will need to inform Webkit about the existence of painted pixels beyond its bounding box. There are a few ways to do this, but after some quick testing, I have found two potential solutions: 

#expand {
    height: 0px;
    box-shadow: 0 0 0 5px rgba(0,0,0,0);
}

#expand {
    height: 0px;
    outline: solid transparent 5px;
}

In my opinion, using the outline property may offer better performance.

Adding these styles to either the #expand or p elements seems to produce the desired effect. If needed, Chrome has specific flags that can be enabled to visualize how redraw regions function, although I currently do not have access to them.

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