Bug 203961 – [GTK] Style toggling using editing commands produces incorrect output

• Component: WebKitGTK
• Status: NEW

[Milan Crha]

What I want to achieve:

Write "000" in normal font, then
write "111" in B+I+U+S, then
write "222" in B+U, by turning off I+S

I do this in WebKit Inspector with:

document.body.contentEditable = true;
document.body.innerHTML = "";
document.execCommand("insertText", false, "000");
document.execCommand("Bold", false, "");
document.execCommand("Italic", false, "");
document.execCommand("Underline", false, "");
document.execCommand("StrikeThrough", false, "");
document.execCommand("insertText", false, "111");
document.execCommand("Italic", false, "");
document.execCommand("StrikeThrough", false, "");
document.execCommand("insertText", false, "222");

Webkit produces HTML, which:
draws "000" in normal font, then
draws "111" in B+I+U, the 'S' is missing, then
draws "222" in B, the 'U' is missing.

The HTML code looks like:

   000<b><strike style="font-style: italic; text-decoration: underline;">111</strike>222</b>

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When I execute the same code in Firefox (67.0), it works as expected and generates this HTML code:

   000<strike><u><i><b>111</b></i></u></strike><u><b>222</b></u>