javascript - When are dynamic scripts executed? -

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i doing google xss games (https://xss-game.appspot.com/level2), couldn't quite figure out why level 2 wasn't working way expecting. though hint says script tags won't work, didn't know why. question when dynamic script tags executed , vary browser?

i tried simple as:

<script>alert();</script>

and while adds element page, doesn't had hoped.

i found post has same problem, solution answer, not explanation: dynamically added script not execute

if site sanitizes script tags allows other html - opens xss. hint in level 2 text in message window having html formatting (italic, color etc.) assumption here - html tags allowed.

so can enter like

<i>hello xss</i>

into message window display text in italic. dom element can have event handler attached - can include executable javascript event handler without script tags.

try entering message window:

<i onmouseover="alert(1)">hello xss</i>

and after submitting message wave mouse on message text.


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