1735590 - Script doesn't run if it's reinserted passing the "type" attribute preparation check after previously failing the "type" preparation check

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect)

Description

[lukew]

Attachment: Test for steps 6-8 of the "prepare a script" algorithm in the HTML specification

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:93.0) Gecko/20100101 Firefox/93.0

Steps to reproduce:

I wrote a test for the "prepare a script" algorithm (https://html.spec.whatwg.org/multipage/scripting.html#prepare-a-script) to test steps 6, 7 and 8 to see what happens if you fail them the first time you insert the script, but pass them the second time you insert the script. I have attached this test as a file.

Actual results:

In Firefox 93 and Nightly, I got:

• Step 6 test: I ran the second time around!
• Step 7 test: I ran the second time around!

Expected results:

I expected the test to print:

• Step 6 test: I ran the second time around!
• Step 7 test: I ran the second time around!
• Step 8 test: I ran the second time around!

This is because step 8 (the "type" attribute check) comes before step 10 which sets the already started flag that prevents the script from being prepared again because of step 1.

I get the expected result in both Chrome and iOS Safari.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: Core & HTML' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.