Bug 124441 – Rendering of table and cell borders with alpha

• Status: NEW
• Component: Layout and Rendering

[Rüdiger Cordes]

Created attachment 217098 [details]
Screenshot excamples

The way in which borders of a table, i.e. table border and cell borders, are rendered in Webkit when the border color has alpha and the table has border-collapse:collapse is not as expected.

In excample 1 everything is ok. No value for cellspacing means 2px between cells. Every cell has its own border which darkens the background-image a bit. In 2 cellspacing is set to 0 and
as expected the borders lay together, the table border too. When in 3 border-collapse is applied the red table border is not visible. With a linewidth of 2px for the table border in 4 it is visible
again. The 1px cell border darkens the inner px of the table border. But why is in 3 no table border visible? The added line for declaration of transitional changed nothing (5 and 6).
Maybe because there is a cell background defined which is opaque? In 7 and 8 the background is removed and again in 7 the table border is not visible. It should shine red through the
0.1 transparency of the cell border. In 8 the table border is visible but the outer cell borders are not visible like in 4 and 6. In the corners the cell border seems to be applied two times and
on the edges the cell borders are too long and darkens the table border.

[Simon Fraser (smfr)]

Pretty sure we have an old bug on this.

[Rüdiger Cordes]

Created attachment 217107 [details]
html docs