Fig. 1. A JavaScript unit, the basic element used for our classification.

Fig. 2. Example of an object function.

Fig. 3. String based edit distance (SED), tree based edit distance (TED) and lexical-token based edit distance (LED).

Fig. 4. Unit that reference their HTML context.

Fig. 5. Types of DOM object references.

Fig. 6. Sample JavaScript unit (1), along with features extracted by static and dynamic analys is (r).

JavaScript functional categories, sorted by frequency in our corpus (discussed in Section 5)

Number of instances indicated in parenthesis in the description field.

Examples of JavaScript tokenization and type-binding

KEY: keyword; VAR: variable; SYM: symbol; NUM: number; STR: string; CMT: comment; REG: regexp.

Examples of string token normalization

Examples of name token normalization

Partial table describing DOM objects references traced in static analysis

Component evaluation results

Error reduction (ER) is measured against the text categorization baseline.

* and ** indicate the improvement over the previous feature set is statistically significant by the one tailed T-test at the 0.05 and 0.01 level, respectively.

Usefulness ratings of our proposed functionality classes from user assessments over 16 subjects, sorted by usefulness