<!doctype html><script><! has only one error
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Here are the (abbreviated) steps (intermingling the tree-construction and tokenizer). 1. `<script>` token causes `html` and `head` elements to be inserted and is processed in the "in head" insertion mode 2. `<script>` token switches the tokenizer to the script data state and switches to the "text" insertion mode 3. `<` switches to the script data less-than sign state 4. `!` switches to the script data escape start state and emits `<!` 5. EOF is reconsumed in the script data state 6. EOF emits an EOF token 7. EOF token (in the "text" insertion mode) is a parse error, `<script>` is popped off the stack of open elements, switches back to the "in head" insertion mode and reprocesses the token 8. EOF token (in "in head") triggers the "anything else clause" which pops the `head` element, switches to "after head", inserts a `body` token, switches to "in body", and reprocesses 9. EOF token (in "in body") stops parsing with no error because the stack of open elements contains `html` and `body` Only step 7 adds a parse error.
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Here are the (abbreviated) steps (intermingling the tree-construction
and tokenizer).
<script>token causeshtmlandheadelements to be inserted andis processed in the "in head" insertion mode
<script>token switches the tokenizer to the script data state andswitches to the "text" insertion mode
<switches to the script data less-than sign state!switches to the script data escape start state and emits<!<script>is popped off the stack of open elements, switches back tothe "in head" insertion mode and reprocesses the token
pops the
headelement, switches to "after head", inserts abodytoken, switches to "in body", and reprocesses
stack of open elements contains
htmlandbodyOnly step 7 adds a parse error.