What are the different ways to integrate Cascading Style Sheets CSS into a web page?

Introduction / Context:
Cascading Style Sheets control the visual appearance of HTML documents. To change colors, fonts, spacing, and layout, you must integrate CSS into your web pages in a way that browsers understand. This question evaluates your knowledge of the three standard integration methods: inline styles, internal style blocks, and external style sheets. Choosing the right method is important for maintainable design and performance.

Given Data / Assumptions:
- We are working with standard HTML and CSS in web browsers.
- The goal is to attach style rules to HTML elements.
- Three commonly taught integration methods are inline, internal, and external styles.
- The question focuses on valid integration techniques, not on specific CSS properties.

Concept / Approach:
Inline styles are applied directly on HTML elements through the style attribute, suitable for very small one off overrides. Internal styles are placed inside a style block in the head section of a single document. External styles are stored in separate .css files that are linked using a link tag, which allows many pages to share the same styles. The correct option should list all three methods together, while incorrect options will either remove some methods or describe nonstandard techniques.

Step-by-Step Solution:
Step 1: Recall that inline styles use the style attribute directly on an element such as a paragraph or heading. Step 2: Remember that internal styles sit in a style block inside the head section of the HTML document. Step 3: Note that external styles are created in a .css file and linked with a link tag in the head. Step 4: Identify the option that clearly mentions all three methods as valid ways to integrate CSS.

Verification / Alternative check:
To verify, create three simple test pages. On one page use an inline style to color a single word. On another use an internal style block to style multiple elements. On a third, link an external .css file and reuse the same rules across several pages. All three techniques will work in modern browsers, confirming that they are standard integration methods.

Why Other Options Are Wrong:
Option B is wrong because browsers do support inline and internal styles. Option C is incorrect since CSS rules inside HTML comments are ignored. Option D is false because browsers do not read style rules directly from a database. Option E is not valid because CSS placed in alert messages is only text and has no effect on layout.

Common Pitfalls:
A common pitfall is overusing inline styles, which makes maintenance difficult and breaks separation of concerns. Another issue is forgetting to link external style sheets correctly, which leads to pages displaying with no styling. Best practice is to rely mainly on external style sheets, use internal styles sparingly for page specific rules, and reserve inline styles for very small overrides or dynamically generated content.

Final Answer:
CSS can be integrated into a web page using inline styles, internal style blocks in the head, and external style sheets linked with a link tag.