When should Playwright be used to check if a web page is correct?

Playwright verifies what a user sees in a web browser.

It is used when a user needs 100% certainty that content displays correctly. A developer should only use Playwright when a user asks for this level of verification.

Playwright opens a web browser and checks what is visible on a page. This tool confirms that the page renders correctly for the user. It is different from checking data in a database or responses from an API. Those checks do not show what the user actually sees. Playwright catches problems when new data fields are not shown on the page. For example, a database might have new names for information. But the web page might still look for old names. The user would see empty spaces, and no error message would appear. Using Playwright takes more time and uses more computer resources. It installs a web browser and runs tests in it. For most small changes, a quick check of data and a visual look at the page are enough. A developer should only use Playwright when a user specifically asks for it. The user might say they want to be "100% sure" or "verify it actually renders." The developer must explain the extra time and cost before starting.

A developer changes how hints are named in a learning application. The database now uses 'hint_1_rule' and 'hint_2_applied'. The web page template still looks for 'hint_medium' and 'hint_large'. A student sees blank hint panels. The developer checks the database and API, and everything looks correct. No errors appear in the system logs. Only by using Playwright, which opens the browser and checks the visible page, does the developer find the problem.

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Playwright verifies what a user sees in a web browser. It is used when a user needs 100% certainty that content displays correctly. A developer should only use Playwright when a user asks for this level of verification.