To make API requests we need access token own account's behalf. I will show you how to get your Access Token of Twitter App by some easy steps.
HTML validation
Are you looking for a way to HTML validate your articles? Please try this. Normally, we can try any online HTML validator available over internet.
What we need is to just copy our page URL to the tool and validate it. But if you want to validate your content with your custom HTML formatting, before
publishing it in your site, you can try this method.