I have created a widget text box that contains just an HTML tag.
<h1>Some heading</h1>
and then insert this widget to a CMS page with url: "cms_page_link".
When I hit the CMS page URL, for example:
http://example.com/cms_page_link/
the page show that widget content just as string with quoted:
"<h1>Some heading</h1>"
not the HTML element as I expected:
Have anyway to get HTML tag as normal?
Go to Content -> Blocks, create a new block, write <h1>Some heading</h1> in it and save.
Go to the CMS page you want to edit, insert the widget CMS Static Block, in the widget select the block you just created, then save the page and it will work.
Write codes like this {{block class="Magento\Framework\View\Element\Template" name="blockname" template="Vendor_Module::test.phtml" my_vars="123,456"}} in your page. Create the template file in you module, you could use variable in it, it is a flexible way. You could get some info from How to retrieve variable from CMS page in Magento 2
CMS Static Block, it doesn't have obvious difference with created a widget text box that contains just an HTML tag. If you doesn't like this way, you could use template, not widget. I will add it in the answer.
You should use in the template htmlspecialchars_decode($variable);
