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Check and edit HTML, CSS, and XHTML.
Identify and validate credit cards used on your Web site.
Read and edit Genealogical Data Communication files on PC.
Validate and search invalid e-mail addresses.
Validate websites against website URLs on your Windows 8 device.
GEDCOM Validator is a tool for checking a GEDCOM file for problems which could lead to data loss when transferring files between different genealogy applications.
Check if the emails are valid or not.
Validate IDPF EPUB files.
Check phone number line type in bulk the fastest and easiest with 100% correctness!
W3schools is a web developers app, with tutorials and references on web development languages such as HTML, CSS, JavaScript, PHP, SQL, W3.CSS, and...