Dear
I have read your job description carefully.
I am glad to present my concern for your job.
If you give me a opportunity to work with you that is my great pleasure. And everything will be OK.
I have a strong sense of responsibility and also detail-oriented.
I specialized in a Javascript, jQuery, HTML5, CSS3.
I think your job is very good for me.
I have a good communication English skill.
Hope hearing from you soon.
Best Regards.