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Further inspecting the source code of the downloaded page, I found the following:

<li id="nav-sequences"
    class="module-load transcript"
    wname="sequences"
    href="/rest/widget/transcript/K06C4.12/sequences">
    <span class="ui-icon ui-icon-close module-close" wname="sequences"
    </span>
    Sequences
</li>

This suggested me to have a look at http://www.wormbase.org/rest/widget/transcript/K06C4.12/sequences and I obtained a page containing the elements found in the DOM inspector.

This can be parsed, for instance using the bs4 python module:

# To get the page
import requests
# To parse the page content
from bs4 import BeautifulSoup
# To get this into Biopython
from io import StringIO
from Bio import SeqIO

rest_template = "http://www.wormbase.org/rest/widget/transcript/{accession}/sequences"
rest = rest_template.format(accession="K06C4.12")
# This did not work with "html.parser"
soup = BeautifulSoup(requests.get(rest).text, "html5lib")

def generate_fasta(soup):
    name = None
    for div in soup.find_all("div"):
        if "ui-helper-hidden" in div["class"]:
            if div["id"] == "content":
                fasta = SeqIO.read(StringIO(div.text), "fasta")
                description_fields = fasta.description.split()
                if len(description_fields) == 4:
                    fasta.id = "_".join(description_fields[:2])
                    if name is None:
                        name = fasta.name
                elif len(description_fields) == 2:
                    # This assumes that the "conceptual_translation"
                    # is after the "unspliced + UTR" or "spliced + UTR"
                    # Otherwise, one would need to pass
                    # the accession as function parameter
                    fasta.id = f"{name}_translation"
                else:
                    fasta.id = "_".join(description_fields)
                yield (fasta.id, fasta)

records_dict = dict(generate_fasta(soup))
print(records_dict['K06C4.12_spliced'])
print(records_dict['K06C4.12_translation'])

Output:

ID: K06C4.12_spliced
Name: K06C4.12
Description: K06C4.12 spliced + UTR
Number of features: 0
Seq('ATGGCCCCACCAAAGCCGTCTGCTAAAGGAGCAAAGAAAGCCGCCAAGACCGTC...TAA', SingleLetterAlphabet())
ID: K06C4.12_translation
Name: conceptual
Description: conceptual translation
Number of features: 0
Seq('MAPPKPSAKGAKKAAKTVTKPKDGKKRRHARKESYSVYIYRVLKQVHPDTGVSS...SK*', SingleLetterAlphabet())